Which muscle responds to increased parasympathetic stimulation?
A dilator pupillae
B. Sphincter pupillae
C. Ciliary body
D. Levator palpebrae superioris
B. Sphincter pupillae
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Microtubules and microfilaments are the primary components of the ________.
A. plasma membrane B. cytoskeleton C. cytosol D. nucleus
Oncogenes ________.
A. stimulate apoptosis B. often stimulate cyclin-dependent kinases that speed up the G1 phase C. prevent formation of cancer cells D. block the ability of cyclins to stimulate cell division
The layers of bone tissue immediately deep to the periosteum are:
A) circumferential lamellae. B) lacunae. C) concentric lamellae. D) trabeculae.
Which portion of the sperm cell is most involved with penetration of the female sex cell?
A. nucleus B. acrosome C. midpiece D. tail E. centriole