What is the main difference between "on" and "off" region receptive fields?
A) Signal processing at the photoreceptor
B) The type of neurotransmitter released by the photoreceptor
C) The nature of the response of the bipolar cell to glutamate
D) The presence of horizontal cells
Answer: C
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The hormone ANP causes systemic blood vessels to
A. constrict, which raises blood pressure. B. constrict, which lowers blood pressure. C. dilate, which raises blood pressure. D. dilate, which lowers blood pressure.
The spinal cord lies within the
A) superior articular foramen.
B) intervertebral foramen.
C) vertebral foramen.
D) transverse foramen.
E) body.
Erection of the penis occurs when
A. the pubic bones move together. B. the bulbourethral muscles contract. C. lymphatic fluid accumulates in the glans penis. D. penile erectile tissue becomes engorged with blood. E. smooth muscle contraction occurs in ductus deferens.
This figure shows the temporomandibular joint. Which number indicates the articular capsule?
A. 1 B. 2 C. 3 D. 4 E. None of the choices is correct.