Ch.30 - Blood Circulation

All of the following will increase heart rate except

stimulation of cold receptors in the skin

Which is not true of baroreceptors?

they are sensitive to changes in the oxygen content of the blood

Which factor increases heart rate?

anxiety and fear

Peripheral resistance is affected primarily by

blood viscosity and the diameter of arterioles

Which is not a mechanism that increases blood volume and therefore venous return of blood to the heart?

atrial natriuretic hormone

The primary fluid flow principle of circulation is based on all of the following except a fluid

flows only when a pressure gradient is absent

Cardiac output is determined by the

stroke volume and heart rate

Which statement is true regarding local control of arterioles?

local vasodilation is also referred to as active hyperemia

Which event would tend to cause a decrease in blood viscosity?

marked anemia

A decrease in total plasma volume results in the ___ mechanism

atrial natriuretic hormone

Minute volume is equal to the

pressure gradient divided by the resistance

When you take a blood pressure reading, the first sound that you hear (systolic) is the

systolic sound, indicating the contraction of the vesicles

Which blood vessel has the largest total cross-sectional area?

capillary

The best description of pulse pressure is the

difference between the systolic and diastolic blood pressure

The pulse in the neck is felt over which artery?

common carotid

The pulse in the wrist is felt over which artery?

radial

Vasomotor control mechanisms influence

diameter of arterioles

A collection of mechanisms that influence the circulation of the blood is the definition for

hemodynamics

The blood in the subclavian vein of the chest had a P1 of 15mmHg. For the blood to flow back to the heart, the P2 in the superior vena cava

would have to be less than 15

Which statement is true?

stimulation by the vagus nerve slows the heart rate

Peripheral resistance to blood flow comes about b/c of

friction between the blood cells and vessel walls

Which is not part of vasomotor control mechanism?

sympathetic simulation of the heart to increase cardiac output

Blood in the veins of which organ is not considered part of the “blood reservoir” system?

skeletal muscle

The chemoreceptors in the carotid bodies are particularly sensitive to

hypercapnia

The effect of what substance is to increase the total blood volume?

ADH and aldosterone

Which statement is not true of the cardiovascular system?

for the body to survive, all parts of the body must be equally supplied w/ blood

Which task must the circulation control mechanism accomplish?

maintain circulation and vary the volume and distribution of the blood circulated

Which factor would cause fluid to leave the blood vessel at the arterial end of the capillary?

high hydrostatic pressure of the blood

Which factor would cause fluid to be reabsorbed into the blood vessel at the venous end of the capillary?

high colloid pressure of the plasma proteins and hydrostatic pressure of the interstitial fluid