A motor unit is
A) a motor neuron and the muscle fibers connected to it.
B) the functional unit of a muscle fiber.
C) many myofibrils in a sarcolemma.
D) many motor end plates at a neuromuscular junction.
A
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The process by which a blastocyst embeds within the uterine endometrium is known as
A. cleavage. B. morulation. C. implantation. D. capacitation. E. the acrosome reaction.
Which of the following statements concerning membrane transport across the plasma membrane is true?
A. Lipid-soluble substances pass through the membrane by dissolving in the lipid bilayer. B. Generally, cations pass through the membrane more easily than anions. C. Water cannot move through the membrane. D. All molecules are moved across by active transport. E. Polar molecules are transported more easily than nonpolar molecules.
The central cavity of the neural tube becomes the ________.
A. epidural space B. ventricles of the brain C. midbrain D. cranial cavity E. cerebrum
You and your lab partners in a human anatomy course have just removed the intestines from an adult cadaver, and cut away connective tissues as necessary to uncoil the intestines into a straight line that could be measured. Your professor told you that the intestinal tract of an adult of this size and gender is typically about 13 ft. Your measurement is 22 ft. One of the lab partners insists that
everything is smaller in preserved cadavers due to dehydration. Address this suggestion, and propose some other explanations for the difference. What will be an ideal response?