Gradation of muscle contraction can be accomplished by stimulating variable portions of each muscle fiber
Indicate whether the statement is true or false
F
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Cerumen is a secretion that
A. lubricates vellus hairs and waterproofs the skin of the limbs. B. lubricates the ear canal and traps debris before it reaches the eardrum. C. cools the body through water evaporation. D. tends to cause acne on the skin of the face. E. acts as a pheremone.
Which of the following hormones contains iodine in its structure?
A) thymosins B) angiotensin I C) erythropoietin D) thyroxine E) growth hormone
a frontal plane divides the body into ________ portions
a. anterior and posterior b. Right and left c. axial and appendicular d. superior and inferior
Which of the following is FALSE regarding erection of the penis?
A. It is a spinal reflex. B. It is a result of sympathetic stimulation of vascular smooth muscle in the erectile tissue of the penis. C. It can be triggered by stimulation of tactile receptors in the penis. D. It is a result of arteriolar vasodilation and venous constriction of blood vessels in the penis. E. It can be inhibited by input to the autonomic nerves from higher brain centers.