Which of the following statements about sperm is not true?
A) They contain very little cytoplasm or stored nutrients.
B) They are sluggish in an alkaline environment.
C) The acrosome is produced by the Golgi apparatus and contains hydrolytic enzymes.
D) The sperm midpiece consists of mitochondria spiraled tightly around the contractile filaments of the tail.
D) The sperm midpiece consists of mitochondria spiraled tightly around the contractile filaments of the tail.
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The link between a first messenger and a second messenger in a cell that responds to peptide hormones is usually
A) cAMP. B) cGMP. C) adenyl cyclase. D) a G protein. E) calcium ion levels.
A diminished reflex response that may indicate damage to a segment of the spinal cord is a(n) _____ reflex
A. hypoactive B. hyperactive C. diminutive D. ponderous E. excessive
Arterioles have no significant parasympathetic innervation, with the exception of the abundant parasympathetic vasodilator supply to the arterioles of the genitalia
a. True b. False Indicate whether the statement is true or false
Which of the following movements does not occur at the knee joint?
A. flexion B. rotation C. abduction D. extension E. All occur at the knee.