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

Anatomy & Physiology

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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?

Anatomy & Physiology

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

Anatomy & Physiology

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.

Anatomy & Physiology

Sympathetic stimulation promotes an overall increase in blood flow resistance.

Answer the following statement true (T) or false (F)

Anatomy & Physiology