An animal that excretes most of its nitrogen in the form of ammonia is called an __________
Fill in the blank with the correct word.
Answer: Ammoniotele
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Which of the following is not characteristic of smooth muscle?
A) The striations are due to the orderly arrangement of actin and myosin. B) Neurons that innervate smooth muscles are under involuntary control. C) Smooth muscle cells are uninucleate. D) Smooth muscles do not contain sarcomeres. E) The thin filaments of smooth muscle fibers are attached to dense bodies.
Under normal circumstances, the factors responsible for making delicate adjustments to the heart rate as circulatory demands change are __________.
a. nerve activity and muscular activity b. cardiac output and stroke volume c. autonomic activity and circulatory hormones d. all of the listed factors
The most common type of nephrons, which have a relatively short nephron loop that does NOT extend deep into the medulla, are called __________ nephrons.
a) cortical b) papillary c) juxtaglomerular d) juxtamedullary
Nicotinic receptors
A) respond to epinephrine. B) respond to norepinephrine. C) open chemically gated sodium ion channels. D) are found at neuroeffector junctions of the autonomic nervous system. E) open chemically gated calcium ion channels.