Which of the following statements about spermatogenesis is not true?
A) Each spermatid forms two sperm.
B) The secondary spermatocytes each form two spermatids.
C) The spermatogonium forms the primary spermatocyte.
D) The primary spermatocyte forms two secondary spermatocytes.
A
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Which of the following are effects of aging on the digestive system?
A. Enamel on teeth becomes thinner B. More likely to develop ulcerations and cancers C. Blood supply decreases D. All of the choices are correct.
The type of muscle cell that lacks transverse tubules, has a single nucleus, and is under
involuntary control is A) skeletal muscle. B) striated muscle. C) smooth muscle. D) cardiac muscle.
The lifespan of a typical RBC is about ____________________.
one year one week one month four months none of the above choices are correct
Which of the following lists the parts of a reflex arc in the correct sequence?
A. Effector, receptor, sensory neuron, motor neuron, interneuron B. Receptor, sensory neuron, interneuron, motor neuron, effector C. Receptor, sensory neuron, motor neuron, interneuron, effector D. Effector, sensory neuron, receptor, interneuron, motor neuron