Which of the following statements indicates the way in which the body's natural defenses protect the skin from the effects of UV damage?
A) The skin is protected by the synthesis of three pigments that contribute to the skin's color.
B) The skin is protected by increasing the number of epidermal dendritic cells, which help to activate the immune system.
C) Carotene, which accumulates in the stratum corneum and hypodermal adipose tissue, is synthesized in large amounts in the presence of sunlight.
D) Prolonged exposure to the sun induces melanin dispersion, which in turn acts as a natural sunscreen.
D
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The tendon reflex is the inhibition of a muscle's contraction that occurs when its tendon is excessively stretched.
Answer the following statement true (T) or false (F)
Damage to the AV node could cause ________ on and ECG.
A. the absence of the T wave B. multiple P waves C. multiple Q waves D. multiple T waves
Smooth muscle tissue is found in the organs of the digestive tract, the walls of blood vessels, and the iris
Indicate whether this statement is true or false.
The ________ artery lies on the boundary between the cortex and medulla of the kidney
A) interlobar B) cortical radiate C) arcuate D) lobar