3rd 25 Flashcards
The second hear sound immediately follows
The T wave
The heart rate tends to be higher in
Women than in Men
The ____ commonly measures about 75 mL.
Stroke Volume
The conduction of electrical signals is fastest in
Purkinje Fibers
Baroreceptors are located in
the aorta and carotid sinuses
During isovolumetric contraction, the pressure in the ventricles
Rises Rapidly
Isovolumetric contraction occurs during the ___ of the electrocardiogram.
R Wave
Which of the following sequences best represents the course of a nerve impulse through the heart.
Sa node >AV node>bundle of his>Purkinje fibers
Freshly oxygenated blood is received by the ______
Left Atrium
All of the following are true regarding the ventricles EXCEPT
The left ventricle expels a greater volume of blood per beat than does the right ventricle.
A persistent, resting heart rate of less than 60 bpm is called _____.
bradyarrhythmia
The innermost lining of the heart wall is ______
endocardium
An anatomical arrangement that reduces the risk for myocardial infarctions is _________.
arterial anastomoses in the coronary circulation.
Compared to skeletal muscle, cardiac muscle has ________.
more mitochondria
A substance that reduces the heart rate is said to exert ________
a negative chronotropic effect.
Which of the following reduces the heart rate?
acetylcholine (Ach)
Because the human heart is myogenic _______
It will even beat even if all nerves to it are severed.
Which of the following vessels are in the coronary sulcus?
the marginal artery and the circumflex artery.
All valves are closed during _______ .
isovolumetric contraction
When the heart is beating at a rate of 75 BPM, the duration of one cardiac cycle is ____ seconds.
0.8
Cardiac output is about _____ liters/min.
4-6
If the vagal nerves to the heart were cut, the result would be that _______.
the heart rate would increase by about 25 bpm.
The foramen ovale _____
connects the two atria in the fetal heart
Which vessel receives blood during the right ventricular systole?
pulmonary arteries
Which of the following is not part of the conduction system of the heart?
AV valve
