Select the best answer or answers from the choices given: Blood flow in the capillaries is steady despite the rhythmic pumping of the heart because of the (a) elasticity of the large arteries, (b) small diameter of capillaries, (c) thin walls of the veins, (d) venous valves.

After arriving at the ER, Leo was put on an iv and was administered nitroglycerin to cause coronary blood vessel dilation.  Blood also was drawn for a series of tests including creatine kinase (CK or CK-MB) and troponins (sometimes referred to as cTnT & cTnI) levels.  Results from these tests would later confirm an MI.  Leo then was wheeled to the cardiac catherization lab where coronary angiography was performed with the following results:       Circumflex artery - 20% blocked       Right coronary artery - 15% blocked       Left anterior descending artery (or anterior interventricular artery) - 80 % blocked Given the results of the angiogram, what part of his heart's muscle most likely was involved in the myocardial infarction?  Explain your reasoning.

In 500 to 750 words, identify and describe the structure and function of the heart, how the cardiac cycle works, and what is cardiac output.

John is your 68-year old neighbor who was recently told by his doctor that his heart’s main pacemaker stopped working (“They told me it is called an SA node”). He knows you are a nurse, so he came to you to ask why his heart is still beating, but only at a rate of 50 times per minute. Please explain using appropriate physiological and anatomical details.

The closure of the mitral valve (bicuspid valve) A) is represented by the P wave on the EKG C) contributes to the first heart sound D) occurs when the tricuspid valve is open

Hello, May I get help with This question? Scenario: Diane C has begun to develop a disorder that is destroying the gap junctions between the contractile myocardial cells in her right ventricle. The most direct consequence of this disorder will be that she has... (See image)

A) The term used to describe one complete heartbeat, or the time for both contraction and relaxation of the heart muscle is the _____________________. B) The term _____?_________ refers to ventricular contraction, while the term ______?________ refers to ventricular relaxation. C) f a patient has a heart rate of 75 beats per minute, then what is the average length of time that each of the following parts of that cycle lasts? (time in secs) -atrial contraction:  ____________________ -atrial relaxation:   ____________________ -ventricular contraction ____________________ -quiescent period:  _____________________ -1 entire cycle: _____________________ D)  When you listen to (auscultate) heart sounds, what you are hearing are the sounds of valves _______?______________. E.) A heart murmur indicates some kind of valve ________?____________.

Blood flowing from the pectoral appendages to the heart would flow through which of the following vessels?   Question 5 options:   A)  Posterior cardinal veins   B)  Subclavian veins   C)  Posterior vena cava   D)  Lateral abdominal veins   E)  Renal portal veins   F)  Hepatic portal veins   G)  Subclavian arteries

Which of the following cardiac tissues has the most rapid conduction velocity? A)The AV node. B) Purkinje fibers. C) The bundle branches. D) Papillary muscles. E) The ventricular.

Question 1: In Coronary Artery Disease (CAD), the coronary arteries become hardened and plaque builds up along the inner walls.  Explain (a) Why somebody may experience angina when exercising, but then feel better when at rest and (b) What “sudden” event must occur for a myocardial infarction? (Hint: The sudden event involves a certain positive-feedback cycle we had discussed in class, and it can be stopped with aspirin.)