Contraction of the smooth muscle layers of the arterioles a. increases the frictional resistance to blood flow. b. may be a way of increasing heat exchange through the skin. c. can increase blood flow to an organ. d. All of the choices are correct.
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| Contraction of the smooth muscle layers of the arterioles |
| a. increases the frictional resistance to blood flow. |
| b. may be a way of increasing heat exchange through the skin. |
| c. can increase blood flow to an organ. |
| d. All of the choices are correct. |
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- Contraction of _______ drives the flow of blood through the aorta and pulmonary arteries. a. atria b. veins c. arterioles d. VentriclesWhich of these statements about arteriovenous shunts in the skin is true?a. They divert blood to superficial capillary loops.b. They are closed when the ambient temperature is very low.c. They are closed when the deep-body temperature rises much above 37° C.d. All of these are true.Which of the following statements is true? a. The longer the vessel, the lower the resistance and the greater the flow. b. As blood volume decreases, blood pressure and blood flow also decrease. O c. Increased viscosity increases blood flow. d. All of the above are true What effect does fascicle arrangement have on a muscle's action? a. left atrium O b. left ventricle c. right atrium O d. right ventricle
- A. Muscles around the arterioles dictates where blood flows in the body…why is this useful? B. All hearts have at least one thinner walled chamber where blood collects called the ____________ and at least one thicker-muscled chamber that squeezes blood out of the heart: v________________. C. The blood that flows from the heart into the gills or lungs is in the _______________ circuit; the blood that flows from the heart to the rest of the body is in the ________________ circuit.When a person engages in strenuous, prolonged exercise, a. blood flow to the kidneys is reduced.b. cardiac output is reduced.c. total peripheral resistance increases.d. systolic arterial blood pressure is reduced.e. blood flow to the brain is reduced.Which of the following is True?a. Arteriole diameter is controlled by nerves, hormones,and chemicals from nearby tissues.b. The sympathetic nervous systems causes constriction ofarterioles in hot conditions.c. Precapillary sphincters are controlled by the nervoussystem.d. In response to major blood loss, the veins and arteriesincrease in diameter.
- Calcium channel blockers are drugs that are given to cause a. an increase in the volume of blood being pumped. b. the afterload to be increased. c. contractility to decrease. d. preload to decrease.bWhich of the following best describes the primary role of resistance vessels? Group of answer choices a.Providing nutrient supply to the walls of larger vessels b. They regulate arterial blood pressure and blood flow within the organs. c. Ensuring blood storage during periods of low cardiac output d. Directing blood flow to specific organs based on demandProlonged pressure on the skin causes reddened areas at the point of contact due to: Select one: a. Tissue damage and inflammation resulting from impaired capillary blood flow b. Occlusion of major arteries causing infarction of the tissue c. Compression of veins resulting in venous engagement d. Arterial vasodilation from smooth muscle relaxation
- Which of the following is true of propagation of longitudinal electrical flow in cardiac muscle. A. Current flows longitudinally from a region of depolarization through ryanodine receptors. B. Longitudinal current flows through inward rectifier potassium channels. C. This current can be detected at the body surface, if the source is large enough. D. A and B. E. All are true.In the aorta, Select one: a. the resistance to blood flow is high, but velocity of blood flow is low. b. the velocity of blood flow is high, but blood pressure is low. c. velocity is diminished because the total cross-sectional area is small. d. the blood pressure and blood velocity are both high. e. the resistance to blood flow and the blood pressure are both low.When blood pressure drops after an injury, the body's response to re-adjust the pressure is increased sympathetic stimulation resulting in (ie. how does the body respond to low blood pressure to bring it back up?) O a. decreased arteriolar dilation and increased cardiac output O b. decreased arteriolar dilation and decreased cardiac output O c. increased arteriolar dilation and decreased cardiac output O d. increased arteriolar dilation and increased cardiac output
