Consider a chemical that blocks the action of acetylcholinesterase. What effect does this have on muscles?
A.
It would cause paralysis.
B.
It would cause action potentials to be inhibited, thereby rendering the muscle useless.
C.
The body would increase it's production of acetylcholine to compensate.
D.
The axons of the motor neurons would atrophy and the muscle would weaken.
E.
The muscle would have no way to relax, and spastic contractions would result.
E
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What internal body temperature is considered the upper limit compatible with life?
a. 104°F b. 106°F c. 108°F d. 110°F e. 112°F
Distinguish among embryonic, fetal, and prenatal development
A) Embryonic development refers to the events that occur during the first 2 months after fertilization. Fetal development begins at the 9th week and continues until birth. Prenatal development consists of both embryonic and fetal development. B) Embryonic development begins at the 9th week and continues until birth. Fetal development refers to the events that occur during the first 2 months after fertilization. Prenatal development consists of both embryonic and fetal development. C) Embryonic development begins at fertilization and occurs until implantation. Fetal development begins at implantation and continues until the end of the second trimester. Prenatal development refers to the events of the third trimester. D) Embryonic development begins at implantation and continues until the end of the second trimester. Fetal development begins at fertilization and occurs until implantation. Prenatal development refers to the events of the third trimester. E) Embryonic development begins at implantation and continues until the end of the second trimester. Fetal development refers to the events of the third trimester. Prenatal development begins at birth and continues to maturity.
Neurons that have several dendrites and a single axon are called
A) anaxonic. B) unipolar. C) bipolar. D) tripolar. E) multipolar.
Graded (local) potentials have ALL of the following characteristics EXCEPT
A) one-way propagation. B) variation of amplitude. C) comparatively long duration. D) no refractory period.