Why are urination and defecation under voluntary control?
A. The nerves that supply external urethral and anal sphincters have varicosities.
B. The external urethral and anal sphincters are innervated by the autonomic nervous system.
C. The urogenital diaphragm is voluntary while the pelvic diaphragm is involuntary.
D. The external and anal sphincters are composed of multi-unit muscle tissue.
E. The external and anal sphincters are composed of skeletal muscle tissue.
E. The external and anal sphincters are composed of skeletal muscle tissue.
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Which of the following is a principle of the fluid mosaic model of cell membrane structure?
A) Phospholipids form a bilayer that is largely impermeable to water-soluble molecules. B) Phospholipids consist of a polar head and a nonpolar tail made of three fatty acid chains. C) The lipid bilayer is a solid at body temperature, thus protecting the cell. D) All proteins associated with the cell membrane are contained in a fluid layer on the outside of the cell.
Conjoined twins result from incomplete twinning, which occurs during the first month of
gestation. 8 Indicate whether the statement is true or false
Which of the following hormones is produced in the thyroid gland?
A) PTH or B) calcitonin
An exercising muscle's inability to respond to stimulation due to a buildup of inorganic phosphate or a depletion of glycogen is called _______, whereas, it is called ______ (two words) if it results from a lack of muscle stimulation by the nervous system
Fill in the blank(s) with correct word