Resistance to blood flow depends mainly on
a. the diastolic pressure.
b. elastic tissue of the vessels.
c. blood vessel diameter.
d. valves in the vessels.
e. ultrafiltration pressure in the capillaries.
Answer: c
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Which of the following statements about nervous and endocrine signaling is false?
A. The nervous system and endocrine system are both regulatory systems, but the two systems do not communicate directly with one another. B. Endocrine signaling is generally more prolonged than nerve cell signaling. C. The nervous system transmits signals between adjacent cells using neurotransmitters, whereas the endocrine system signals with hormones. D. Neurotransmitters function only over short distances, whereas hormones can affect cells throughout the body. E. Nerve cell signaling is generally more rapid than endocrine signaling.
In open water, the undissolved remains of dead organisms and other organic material that drifts toward the bottom is called ________ organic matter
Fill in the blank(s) with correct word
Egg cells are fertilized in the
A. cervix. B. vagina. C. ovary. D. oviduct.
Based upon the kind of aggression exhibited by male crickets, Alexander (1961) classified the cricket encounters into ______ levels.
A. Three B. Four C. Five D. Six