The most important determinant of vascular resistance is:
friction between the blood and the vessel walls
the diameter of the arterioles
A combination of neural and hormonal mechanisms
differences in the length of the blood vessels
all of the choices are correct
friction between the blood and the vessel walls
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A local depolarization of a muscle fiber sarcolemma due to an initial influx of sodium is called a(n) ___.
a. End plate potential b. action potential c. refraction d. repolarization
All of the following are veins of the lower limbs EXCEPT the ________
A) external iliac vein B) fibular vein C) popliteal vein D) hepatic veins
Which structure of the hair follicle supplies the capillaries that provide the growing hair with oxygen and nutrients?
A. Hair root B. Hair papilla C. Hair matrix D. Hair shaft E. Hair bulb
Which of the following statements concerning vision is false?
A. Rods cannot detect color. B. The visual pigment of cones is iodopsin. C. Most of the optic tract axons terminate in the medial geniculate nucleus of the thalamus. D. Association neurons in the inner retinal layers modify signals of rods and cones. E. Most of the optic tract axons terminate in the lateral geniculate nucleus of the thalamus.