The midpiece of the sperm tail contains mostly ________
Fill in the blanks with correct word
mitochondria
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From largest to smallest, the correct sequence for the following passageways is
A. bronchioles, terminal bronchioles, respiratory bronchioles, bronchi, alveoli. B. bronchi, bronchioles, respiratory bronchioles, terminal bronchioles, alveoli. C. alveoli, bronchioles, terminal bronchioles, respiratory bronchioles, bronchi. D. bronchi, bronchioles, terminal bronchioles, respiratory bronchioles, alveoli. E. terminal bronchioles, respiratory bronchioles, bronchi, bronchioles, alveoli.
Which of the following effectors in NOT innervated by the autonomic nervous system?
A) cardiac muscle B) glands C) skeletal muscle D) smooth muscle
In comparing sheep brains and human brains, one notes that, in humans, ________
A) there is only a single mammillary body; sheep have two B) the pons is relatively smaller C) the fornix is thinner than the corpus callosum D) the superior and inferior colliculi are relatively larger
Which best describes a role of L-type Ca2+ channels in cardiac muscle cells?
A. They are responsible for preventing tetanic contractions. B. They act as non-conducting voltage sensors that mediate excitation-contraction coupling. C. They are directly responsible for making cardiac muscle fatigue-resistant. D. They function exactly the same in cardiac muscle cells as they do in skeletal muscle. E. They cause the absolute refractory period to be very brief.