Which of the following is responsible for initiating changes in membrane potential resulting in an electrical signal?
a. opening of voltage-gated ion channels
b. changes in membrane permeability in response to a stimulus
c. closing of voltage-gated ion channels
d. a change in the movement of ions through leak channels
e. closing of voltage-gated potassium channels
B
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Which of the following helps determine the age of an animal?
a. tartar and stains on teeth b. the angle of the teeth c. deciduous or permanent teeth d. all of the above help determine the age of an animal
____________________ is the bending of light rays as they pass from one medium to another
Fill in the blank(s) with correct word
Answer the following statements true (T) or false (F)
1. The end result of spermatogenesis is the formation of four cells, each containing 23 chromosomes. 2. As spermatogenesis takes place, each cell division moves the sperm closer to the exterior wall of the seminiferous tubule. 3. The epididymis is a tightly coiled tube attached to the testes and is about 6 feet long. 4. The epididymis makes up part of the spermatic cord. 5. Only about 1% of the primary follicles in the ovary develop into a mature follicle. 5.
What effect did decreasing the extracellular sodium have on the resting membrane potential?
A) Only a small change occurred, because the resting neuron is not very permeable to sodium. B) Only a small change occurred, because the sodium channels were mostly open. C) The resting membrane potential disappeared. D) The resting membrane potential became less negative.