Contraction of muscles within this structure leads to alteration in the shape of the lens
A) choroid B) pupil C) iris D) ciliary body
Answer: D
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What structure transports both urine and semen from the penis?
A) ductus deferens B) urethra C) seminal vesicles D) None of the listed responses is correct.
Which pattern of hormone secretion, represented by epinephrine, can have dramatic changes in its concentration and circulating levels?
A. chronic hormone secretion B. long-term hormone secretion C. episodic hormone secretion D. acute hormone secretion
The most caudal part of the brain, the ________, is continuous with the spinal cord.
A. thalamus B. pons C. medulla oblongata D. hypothalamus E. cerebellum
The perception threshold describes the
A) intensity of stimulus required to generate an action potential. B) concept that neurons higher in the sensory pathway can dampen the intensity of a stimulus. C) convergence of information from multiple primary sensory neuron onto a single secondary neuron. D) intensity of stimulus required to generate a receptor potential.