correct statement about gap junctions:

The first sound of a cardiac cycle occurs when the _____ and ______   (select them in alphabetical order) are closing.   The second sound of a cardicac cycle occurs when the  _______ and ________  (select them in alphabetical order)  are closing.   Word Options for Blanks: (some may not be used, some may be used more than once) aorta aortic valve bicuspid valve coronary sinus inferior vena cava left atrium left ventricle pulmonary arteries pulmonary trunk pulmonary valve pulmonary veins right atrium right ventricle superior vena cava tricuspid valve

Which of the following volumes should be the greatest? end-diastolic volume (EDV) stroke volume (SV) end-systolic volume (ESV) cardiac output (CO)

Once you have studied the wiggers diagram   Create your own outline of the steps with a brief explanation of each step. Why each step occurs when it does; example p-wave occurs before atrial contraction becasue it is the indication that electrical current traveled through the atria to cause atrial depolorization. You should cover all major steps from start to end of a single cardiac cycle. number of steps you include are up to you depending on how you are looking at it, but make sure all major steps are covered

Which of these will increase the heart rate? sympathetic stimulation of SA node parasympathetic stimulation to the SA node the application of adrenalin (epinephrine) to the SA node O A and C O All of the above

Put the following events in the proper order for cardiac conduction. Group of answer choices:   SA Node initiates action potential AV node initiates action potential Signal moves to AV bundle in between the ventricle Purkinje fibers lead to ventricular contraction Signal travels to AV node Purkinje fibers lead to atrial contraction   1  2                                      3                                                                                                 4

Valves between which structures of the heart shown in the figure control the direction of the movement of oxygenated blood within the heart and as it is pumped to the systemic circuit?

Describe one cardiac cycle, beginning with both atriaand ventricles relaxed

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 entry of calcium into a ventricular muscle cell helps to maintain depolarization of the membrane during the plateau phase of the action potential, but this calcium also performs what other function?