Which hormone is secreted by the pineal gland?
A. Insulin
B. Cortisol
C. Oxytocin
D. Melanin
E. Melatonin
Answer: E
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Matching
A) Tetanus B) Maximal stimulus C) Wave summation D) Muscle tone E) Multiple motor unit summation 17) The stimulus above which no stronger contraction can be elicited, because all motor units are firing in the muscle. 18) Determined by alternating motor units of a muscle organ even when the muscle is at rest. 19) Continued sustained smooth contraction due to rapid stimulation. 20) The situation in which contractions become stronger due to stimulation before complete relaxation occurs. 21) How a smooth increase in muscle force is produced.
What chemical is secreted by motor neurons at neuromuscular junctions in skeletal muscles?
A. Acetylcholine B. Acetylcholinesterase C. Sodium D. Calcium
How do iguanas maintain water and ion balance?
A) Marine iguanas produce urine that contains a higher ion concentration than blood. B) A specialized salt gland in their nose produces a highly concentrated salt solution that is expelled. C) Marine iguanas use their kidneys to excrete excess salt. D) Marine iguanas need to drink fresh water on land to maintain the optimal water and ion balance.
The two regions of the skin are the ________
A) epidermis and dermis B) stratum basale and epidermis C) epidermis and hypodermis D) dermis and hypodermis