When it is cold, the __________ contracts and draws the testes closer to the body to keep them warm.
A. cremaster muscle
B. pampiniform plexus
C. corpus spongiosum
D. perineum
E. corpus cavernosum
A. cremaster muscle
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Which of the following is the primary second messenger in G-protein coupled post-synaptic cells?
A) NO B) CO C) cAMP D) GABA E) ATP
Describe the two primary types of glands
A) Endocrine glands release their substances into the interstitial fluid; exocrine glands release their secretions into ducts that open onto an epithelial surface. B) Endocrine glands release their secretions into ducts that open onto an epithelial surface; exocrine glands release their substances into the interstitial fluid. C) Mucus glands secrete mucus through a duct to the inside surface of body; sweat glands secrete sweat through a duct to the outside surface of the body. D) Sweat glands secrete sweat through a duct to the outside surface of the body; oil glands secrete sebum through a duct to the outside surface of the body. E) Endocrine glands release their substances into the interstitial fluid; exocrine glands release their secretions through a duct to the outside surface of the body.
To accommodate for their high surface to volume ratio, smaller mammals
a. reduce the size of each alveolus. b. increase alveolar density. c. increase the density of capillaries used in gas exchange. d. reduce the size of each alveolus and increase alveolar density. e. all of these.
Both nails and hair are produced by stratum basale of the epidermis
Indicate whether the statement is true or false