Discuss how the nervous system is involved in the regulation of heart rate. What will be an ideal response?
Concepts to Consider: Both the medulla and the hypothalamus are involved. The medulla contains
cardiac centers that connect to the SA node via the sympathetic and parasympathetic divisions of the
autonomic nervous system. The sympathetic nerves release norepinephrine, which increases heart rate.
The parasympathetic nerves release acetylcholine, which acts in the opposite way. The hypothalamus
responds to stress by stimulating release of epinephrine and norepinephrine from the adrenal glands.
These hormones increase heart rate.
You might also like to view...
In the cross AaBbCc à— AaBbCc, what is the probability of producing the genotype AABBCC?
A) 1/4 B) 1/8 C) 1/16 D) 1/32 E) 1/64
Which of the following statements is false about
pioneer species? a. They have wide ranges of tolerance. b. Many partner with nitrogen-fixing bacteria. c. They remain permanent residents of the community. d. They include lichens and plants with short life cycles. e. They are often small annuals with wind dispersed seeds.
Four of the five choices listed below are members
of the same group. Select the exception. a. archaeans b. amoebozoans c. diatoms d. dinoflagellates e. euglenoids
During swallowing, the air passageway of the pharynx is covered by the
a. larynx b. epiglottis c. trachea d. bronchi