You are riding a bicycle in traffic when suddenly you hear the blast of a truck horn right beside you. What part of the brain is especially important in triggering a feeling of fear?
A. Mammillary bodies
B. Thalamus
C. Hippocampus
D. Amygdala
E. Nucleus accumbens
D. Amygdala
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While a photoreceptor responds to a single photon of light, a person cannot see a single photon. Explain.
What will be an ideal response?
When it is cold, the __________ contracts and draws the testes closer to the body to keep them warm.
A. cremaster muscle B. pampiniform plexus C. corpus spongiosum D. perineum E. corpus cavernosum
Which of the following statements about blood vessels is FALSE?
A. Large and medium-sized arteries are deep. B. Veins that accompany arteries often have the same names. C. Deep veins are often paired. D. Most medium and large veins have one-way valves. E. Anastomoses are more common in arteries than veins.
Sympathetic stimulation promotes an overall increase in blood flow resistance.
Answer the following statement true (T) or false (F)