The principal male sex steroid hormone is ____________________
Fill in the blank(s) with correct word
testosterone
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The ________ of a sperm contains the enzymes essential for fertilization
A) acrosome B) flagellum C) nucleosome D) neck E) nucleus
The adrenocortical hormones cortisol and aldosterone are peptide hormones
Indicate whether the statement is true or false
Choose the statement that correctly categorizes cardiac muscle tissue.
A. The fibers lack I and A bands. B. Dense bodies anchor thin filaments. C. The fibers of cardiac muscle lack branches. D. The intercalated discs contain gap junctions.
An antibody test on smooth muscle reveals fewer dense bodies and intermediate filaments in a patient with a colon disorder. What is the purpose of these structures?
A. can rapidly develop action potentials in smooth muscle cells B. shallow invaginations of cell membrane C. maintain relatively constant tension in smooth muscle for a period of time D. part of the intracellular cytoskeleton E. act as enzymes that remove phosphate from myosin