chapter 11

true or false: an increase in blood vessel diameter causes atrial blood pressure to decrease?

True

what part of the heart's intrinsic conduction system carries impulses into the inter ventricular septum?

atrioventricular bundle

what can cause a decrease in cardiac output?

decrease blood volume

true or false: an increased firing of the parasympathetic nervous system causes increased cardiac output?

false

true or false: diastolic pressure si the blood pressure in the arteries at the peak of ventricular contraction

false

true or false: during ventricular diastole, the bicuspid and tricuspid valves are closed

false

true or false: the semilunar valves prevent the back flow of blood into the atria when the ventricles are contracting

false

pulmonary circulation involves blood flow to and from the heart and the:

lungs

in which layer of the heart and pericardium would damage to cardiac muscle show up?

myocardium

what is the function of the heart valves

preventing back flow of blood

what is the correct path for the transmission of an impulse in the intrinsic condition system of the heart?

sinoatrial (SA) node, atrioventricular (AV) node, atrioventricular (AV) bundle, right and left bundle branches, Purkinje fibers

the volume of blood pumped out by each ventricle with each beat of the heart is called the:

stoke volume

what term refers to the contraction of the heart?

systole

through which valve will blood flow when leaving the right atrium

tricuspid valve

true or false: arteries always carry blood away from the heart

true

which of these will increase arterial blood pressure

vasoconstriction of arteries

at what point during the cardiac cycle are the semilunar valves open?

ventricular systole

the mitral valve is normally closed:

when the ventricle is in systole

what chamber of the heart will blood enter after passing through the bicuspid valve?

left ventricle

which of these will result when the pressure in the ventricles rises higher then the pressure in the atria? a. Atrioventricular valves close. b. Semilunar valves close. c. Semilunar valves open. d. Atrioventricular valves open.

a. Atrioventricular valves close.

which one of the following is caused by the decrease in venous return to the heart? a. a decrease in stroke volume and cardiac output b. a decrease in stroke volume and an increase in cardiac output c. an increase in stroke volume and cardiac output d. an increase in stroke volume and a decrease in cardiac output e. no change in stroke volume and cardiac output

a. a decrease in stroke volume and cardiac output

which of these will decease heart rate? a. increase in calcium ion concentration b. stimulation by vagus nerves c. increase in body temperature d. secretion of epinephrine

b. stimulation by vagus nerves

what structure divides the left from the right ventricle?

interventricular septum