Ch. 20 questions

t/f The lymphatic capillaries reabsorb as much as 20% of the fluid lost by the blood capillaries.

false

t/f: Heart rate and stroke volume decrease with a decrease in parasympathetic stimulation.

false

t/f: Increased sympathetic stimulation causes vasodilation, bringing elevated blood pressure back to normal.

false

empties into another named vessel (not SVC or IVC)

femoral, posterior intercostal veins, superior mesenteric, axial, gastric

When the sphincters are open, blood will ____________ the capillary bed.

fill

t/f The net osmotic pressure is equal at both the arterial and the venous ends of the capillary.

true

The action potential from the brain to the heart travels along which nerve(s)?

vagus nerve

Drag each label into the appropriate position to identify whether the characteristic is indicative of arteries or veins. -convergence -relatively larger diameter -relatively larger lumen -superficial locations -contain valves -sites used for blood donations

veins

Drag each label into the appropriate position to identify whether the characteristic is indicative of arteries or veins. -termed "capacitance vessels" -contain the majority of blood at any one time -provide relatively consistent velocity of blood flow -collapsed when empty -rely on muscle pumps to propel blood

veins

Approximately what percent of fluid that exits the capillaries at the arterial end reenters the capillaries at the venous end?

90%

When this occurs, blood is ____________ to tissue or organs elsewhere.

diverted

Why do fluids leave the capillaries at the arterial end?

The net filtration pressure of the blood is higher at the arterial end than it is at the venous end.

Drag each label to the appropriate position to identify whether the given vessel directly arises from the aorta or from another (other) named vessel. -left common carotid -superior mesenteric -renal -esophageal -gonadal

aorta

Drag each label into the appropriate position to identify whether the characteristic is indicative of arteries or veins. -divergence -thicker layers of smooth muscle -relatively thicker walls -profuse elastic fibers in the tunica media

arteries

Drag each label into the appropriate position to identify whether the characteristic is indicative of arteries or veins. -termed "resistance vessels" or "pressure reservoirs" -usually carry oxygenated blood from heart to body. -pulsatile flow of blood -exhibit greater ability to alter vessel diameter

arteries

Most of the redirection will occur in the _______.

arterioles

Empties directly into the superior or inferior vena cava

azygos vein, renal, lumbar veins, left brachiocephalic, hepatic

Which of the following is not detected by chemoreceptors in the carotid and aortic bodies?

blood pressure

where are baroreceptors found?

carotid sinuses

Action potentials are conducted from the baroreceptors to the brain via which nerve?

glossopharyngeal nerve

Which of the following will not increase the heart rate?

increased blood pressure

After a meal the ____________ receive priority and the skeletal muscles receive very little flow.

intestines

Which of the following contains chemoreceptors?

medulla oblongata

During exercise the skeletal muscles receive ____ blood flow.

more

Drag each label to the appropriate position to identify whether the given vessel directly arises from the aorta or from another (other) named vessel. -internal iliac -sigmoid -jejunal -pancreatic -left axillary

other vessel

Blood flow is ____________ according to metabolic needs.

redirected

Constriction of these sphincters ____________ the blood flow through their respective capillaries.

reduces

t/f Increased sympathetic stimulation causes increased heart rate and stroke volume.

true

Capillary beds have precapillary ____________ at the junction of capillaries and the metarteriole.

sphincters