Why is the contraction strength of smooth muscle relatively independent of its resting length?
A. It is involuntary muscle.
B. It gets nearly all of its Ca2+ from the extracellular fluid.
C. It does not have intercalated discs.
D. It is regulated by a length-tension relationship.
E. It does not have sarcomeres.
Answer: E
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The DNA triplet is the same sequence as the ________, except that U replaces T.
A) chromatin B) histone C) codon D) gene E) anticodon
The cell membrane of a neuron has both gated and non-gated ion channels. Which type of non-gated channel is more abundant?
A. non-gated potassium channels B. non-gated sodium channels
What structure transports urine from the bladder to outside of the body?
A) bladder B) ureter C) urethra D) liver E) kidneys
Association tracts
A. connect different regions of the cerebral cortex with the opposite hemisphere. B. extend between the right and left cerebral hemispheres. C. link the cerebral cortex to the caudal brain regions and the spinal cord. D. connect different regions of the cerebral cortex within the same hemisphere. E. None of the choices is correct.