what does the term cardiac refer to crash course

What is the meaning of Crash Course?

Start studying The Heart, part 1 - Under Pressure: Crash Course. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

What is cardiac arrest?

Your heart gets a lot of attention from poets, songwriters, and storytellers, but today Hank's gonna tell you how it really works. The heart’s ventricles, at...

What is cardiac compression?

Apr 13, 2012 · 5 minutes crash course in cardiology : Echocardiogram in Pulmonary arterial hypertension. April 13, 2012 by dr s venkatesan. Echocardiogram in pulmonary HT has many aims . Identify the etiology. Assess the effects of PAH on the right heart. Estimate the severity of PAH. Possibly prognosticate. Echo helps us to confirm the valvular, myocardial or congenital heart …

What is a crash course in diplomacy?

The Heart Crash Course. PrenursingSmarterPro. Get Quizlet's official TEAS - 1 term, 1 practice question, 1 full practice test. Preview. STUDY. Flashcards. Learn. Write. Spell. Test. PLAY. Match. Gravity. Created by. sydneymg96. Terms in this set (35) What is the heart's main task? to maintain a pressure gradient.

What does the term cardiac refer to?

1a : of, relating to, situated near, or acting on the heart. b : of or relating to the cardia of the stomach. 2 : of, relating to, or affected with heart disease cardiac patients.

What is cardiac part?

The cardiovascular system is sometimes called the blood-vascular, or simply the circulatory, system. It consists of the heart, which is a muscular pumping device, and a closed system of vessels called arteries, veins, and capillaries.

What is heart crash?

A myocardial contusion is a bruise of the heart muscle, which can occur with serious bodily injury. This is most commonly caused: by a car accident. by falling from heights greater than 20 feet. by receiving chest compressions during cardiopulmonary resuscitation (CPR)

What is the heart's only real main concern maintaining?

The truth is, the heart is really just a pump, a big, wet, muscly brute of a pump, and it doesn't care about poetry or chocolate or why you're crying. The heart has only one concern: maintaining pressure.Jul 6, 2015

What is cardiovascular system anatomy and physiology?

human cardiovascular system, organ system that conveys blood through vessels to and from all parts of the body, carrying nutrients and oxygen to tissues and removing carbon dioxide and other wastes. It is a closed tubular system in which the blood is propelled by a muscular heart.

What is heart in anatomy and physiology?

Abstract. The heart is a complex organ that pumps blood through the body with an intricate system of muscle layers, chambers, valves and nodes. It has its own circulation system and receives electric impulses that make it contract and relax, which triggers a sequence of events forming the cardiac cycle.Jan 29, 2018

What is ventricular contraction called?

Ventricular contraction called systole. 2. Ventricular relaxation called diastole.

What's the main artery called?

the aortaThe largest artery is the aorta, the main high-pressure pipeline connected to the heart's left ventricle. The aorta branches into a network of smaller arteries that extend throughout the body. The arteries' smaller branches are called arterioles and capillaries.Jun 23, 2021

What is the cardiac cycle?

A cardiac cycle is defined as the steps involving the conversion of deoxygenated blood to oxygenated blood in the lungs and pumping it by the heart to the body through the aorta [40].

When you hear a heartbeat you're really hearing the heart?

When you listen to your heart really closely, you can usually hear two different sounds. Most people describe these sounds as “lub” and “dub”. Every time you hear “lub dub” when listening to your heart, you are actually hearing one full heartbeat!

Where are pacemaker cells located?

The pacemaker cells at the start of the conduction system have the leakiest membranes and therefore the fastest inherent rhythms, so they control the rate of the entire heart.#N#And those fast, leaky cells are found in the sinoatrial node, or the SA node, up in the right atria. They essentially turn the whole SA node into your natural pacemaker. After those pacemaker cells make themselves fire, they spread their electrical impulses to cardiac muscle cells throughout the atria. The impulses leap across synapse-like connections between the cells, called gap junctions, and continue down the conduction system until they reach the atrioventricular node, or AV node, located just above the tricupsid valve.#N#Now, when the signal hits the AV node, it actually gets delayed for, like, a tenth of a second, so the atria can finish contracting before the ventricles contract. Without that delay, all the chambers would squeeze at once, and the blood would just splash around and not go anywhere. So instead, the atria contract and blood drops down into the ventricles, and then a moment later, the signal moves on and triggers the ventricles to squeeze, making the blood flow out of the heart.#N#And there are two tricks to a good ventricular contraction. One, the ventricles are so large that the signal has to be distributed evenly to ensure a coordinated contraction; and two, the ventricles need to squeeze like they're squeezing a tube of toothpaste -- from the bottom up, to accelerate the blood through the big arteries at the top of the heart. So from the AV node the signal travels straight down to the inferior end of the heart and gets distributed to both sides. The path the electrical impulse takes to the bottom of the heart is called the atrioventricular bundle , also known by the more rad name, the bundle of His, where it branches out to the left and right ventricles. Finally, the signal disperses out into Purkinje fibers, which trigger depolarization in all surrounding cells, causing the ventricles to contract from the bottom up like toothpaste tubes, at which point the whole cycle starts all over again.#N#And everything I just described to you, from when the SA node fires to when the last of the ventricular cells contract, takes about 220 milliseconds.#N#So that is how your heart beats, but I know what you want. You want to get back to talking about TV shows and McDreamy and his paddles. It's totally understandable.

How do pacemakers work?

So pacemaker cells are, in a way, your heart's very own brain, generating the initial spark that sends a current through your heart's internal wiring system, known as the intrinsic cardiac conduction system . This system transmits electricity along a precisely timed pathway that ends with atrial and ventricular contractions, also known as heartbeats, and it begins with pacemaker cells generating their own action potentials.# N#In most cells, the action potential starts with the resting potential, which the cell maintains by pumping sodium ions out and potassium ions in, right? Then, when some stimulus causes the sodium channels to open up, the sodium ions flood back in, which raises the membrane potential until it reaches its threshold. Pacemaker cells operate the same way, except for that initial stimulus. They don't need it. Their membranes are dotted with leaky sodium and potassium channels that don't require any external triggers; instead, as their channels let sodium ions trickle in, they cause the membrane potential to slowly and inevitable drift toward its threshold. Since the leaking happens at a steady rate, the cells fire off action potentials like clockwork, and the leakier the membrane gets, the faster it triggers action potentials.

Is cardiac muscle striated?

Your cardiac muscle is also striated and uses sliding filaments to contract, but the similarities end there. For one, their cells look pretty different: skeletal muscle tissue has long, multinucleate cells, while cardiac cells are squat, branched out, and interconnected, each one with one or two central nuclei.

What is the heart's concern?

The heart has only one concern: maintaining pressure. If you've ever squeezed the trigger on a squirt gun or opened a can of shaken soda, you've seen how fluids flow from areas of high pressure, like inside the gun or the can, to areas of low pressure, like outside.

How does the heart work?

Your heart is divided laterally into two sides by a thin inner partition called the septum. This division creates four chambers, two superior atria, which are the low-pressure areas, and two inferior ventricles that produce the high pressures. Each chamber has a corresponding valve, which acts like... like a bouncer in a club at closing time. Like, he'll let you out, but not back in. When a valve opens, blood flows in one direction into the next chamber, and when it closes, that's it. No blood can just flow back into the chamber it just left. So if you put your ear against someone's chest -- and yeah, ask for permission first -- you hear that lub-dub, lub-dub. What you're really hearing are the person's heart valves opening and closing.#N#It's a relatively simple but quite elegant setup, really. Functionally, those atria are the receiving chambers for the blood coming back to the heart after circulating through the body. The ventricles, meanwhile, are the discharging chambers that push the blood back out of the heart. As a result, the atria are pretty thin-walled because the blood flows back into the heart under low pressure, and all those atria have to do is push it down into the relaxed ventricles, which doesn't take a whole lot of effort. The ventricles are beastly by comparison. They're the true pumps of the heart and they need big, strong walls to shoot blood back out of the heart with every contraction.#N#And the whole thing is connected to your circulatory system by way of arteries and veins. We'll go into a whole lot more detail about these later, but the thing to remember first, if you don't already remember it, is that arteries carry blood away from the heart and veins carry it back toward the heart. To differentiate the two, anatomy diagrams typically depict arteries in red, while veins are drawn in blue, which, incidentally, is part of what has led to the common misconception that your blood is actually blue at some point, but it isn't. It is always red. It's just a brighter red when there's oxygen in it.

Why are the atria thin?

As a result, the atria are pretty thin-walled because the blood flows back into the heart under low pressure, and all those atria have to do is push it down into the relaxed ventricles, which doesn't take a whole lot of effort. The ventricles are beastly by comparison.

Where is the heart located in the body?

It sits at an angle, though, with one end pointing inferiorly toward the left hip and the other towards the right shoulder, so most of its mass rests just a little bit left of the midsternal line. The heart is nestled in a double walled sac called the pericardium.

Why do mammals have a surprisingly similar total number of heart beats in their lifetime?

( 1:25 ): Because small mammals have faster heart rates but shorter life spans, and large mammals have slower heart rates but longer life spans, most mammals have a surprisingly similar total number of heart beats in their lifetime.

What is the wall of the heart made of?

The wall of the heart itself is made up of yet more layers, three of them: that epicardium on the outside, the myocardium in the middle, which is mainly composed of cardiac muscle tissue that does all the work of contracting, and the innermost endocardium, a thin white layer of squamous epithelial tissue.

Why does blood look red?

Arterial blood looks bright red because it's full of oxygen, whereas vein blood looks dark red because of its lack of oxygen. ( 5:40 ): The pulmonary arteries and veins are the big exception to the artery/vein, oxygen/no oxygen rule.

What does it mean when your heart stops beating?

A person's heart usually carries on beating in a heart attack, occurs heart stops completely unless they go into cardiacarrest - which means the heart has stopped beating completely. A FATAL IGNORANCE; Cardiac arrests are killing tens of thousands of people, but the public doesn't know how to help.

What is the purpose of a cardiac catheter?

cardiac catheterizationthe insertion of a catheter into a vein or artery and guiding of it into the interior of the heart for purposes of measuring cardiac output, determining the oxygen content of blood in the heart chambers, and evaluating the structural components of the heart.

What is the meaning of "flutter"?

1.pertaining to the heart. 2.pertaining to the ostium cardiacum. cardiac arrestsudden and often unexpected stoppage of effective heart action. Either the periodic impulses that trigger the coordinated heart muscle contractions cease or ventricular fibrillationor flutteroccurs in which the individual muscle fibers have a rapid irregular twitching. ...

What is the name of the sensation of a heartbeat?

A. Heart problems may manifest as sensation of the heartbeats (called palpitations, as with rhythm problems), chest pain (usually a feeling of tightness or pressure in the chest rather than frank pain), or difficulty breathing (called dyspnea).

Where is the catheter inserted?

The catheter is inserted into the femoral vein and advanced through the inferior vena cava (or, if into an antecubital or basilic vein, through the superior vena cava), right atrium, and right ventricle and into the pulmonary artery. B,Left-sided heart catheterization.

Examples of crash course in a Sentence

Before her trip, she took a crash course in Russian culture and history at the local university.

English Language Learners Definition of crash course

What made you want to look up crash course? Please tell us where you read or heard it (including the quote, if possible).

Citation

"crash course." Definitions.net. STANDS4 LLC, 2021. Web. 13 Aug. 2021. < https://www.definitions.net/definition/crash+course >.

Are we missing a good definition for crash course? Don't keep it to yourself..

The ASL fingerspelling provided here is most commonly used for proper names of people and places; it is also used in some languages for concepts for which no sign is available at that moment.

Definitions & Translations

Get instant definitions for any word that hits you anywhere on the web!