1) the gray horns of the spinal cord contain mainly
a) nerve tracts.
b) columns.
c) meninges.
d) nerve cell bodies.
e) funiculi.
2) sperm production occurs in the
a) ductus deferens.
b) seminiferous tubules.
c) epididymis.
d) seminal glands (seminal vesicles).
e) rete testis.
3) ________ open or close in response to binding specific molecules.
a) leak channels
b) activated channels
c) chemically-gated channels
d) voltage-gated channels
e) voltage-gated and chemically-gated channels
4) which region of the uterine tube captures the ovum?
a) ampulla
b) anterior segment
c) infundibulum
d) posterior segment
e) isthmus
5) in an experimental situation, a rabbit is exposed to a viral antigen to which it makes
antibodies. these antibodies are then purified and injected into a human with the same
viral disease. this is an example of
a) innate immunity.
b) active immunization.
c) passive immunization.
d) natural immunity.
e) alloimmunity.
6) end-systolic volume is defined as the:
a) amount of blood a ventricle ejects per cycle
b) amount of blood which backflows into a ventricle
c) amount of blood remaining in an atrium after atrial systole
d) amount of blood remaining in a ventricle after contraction
e) stroke volume multiplied by the heart rate
7) ________ are the most numerous type of neuron in the cns.
a) sensory neurons
b) motor neurons
c) unipolar neurons
d) bipolar neurons
e) interneurons
8) if a fair-skinned person is sunburned, why does his or her skin turn red?
a) the blood flow to the skin increases.
b) the number of red melanocytes in the skin increases.
c) melanocytes increase production of red pigments.
d) the blood supply to the skin decreases.
e) increased heat causes the skin to turn red.
9) each of the following factors affects the rate of external respiration, except the
a) po2 of the alveoli.
b) pco2 of the blood.
c) thickness of the respiratory membrane.
d) diameter of an alveolus.
e) solubility of oxygen in plasma.
10) the term general senses refers to sensitivity to all of the following, except
a) temperature.
b) taste.
c) touch.
d) vibration.
e) pain.
11) the smallest stable units of matter are
a) atoms.
b) molecules.
c) protons.
d) neutrons.
e) electrons.