Why does the body spend so much energy to filter so much blood at the kidney and then reabsorb most of it?
What will be an ideal response?
Answer: This system in which the entire body water is filtered 4.5x per day, enables the elimination of water-soluble toxins that might otherwise be very harmful. Also, if the body takes in an unknown toxin, for which is does not have a system for active secretion, such a toxin will be automatically eliminated as it will be filtered but not absorbed.
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During muscle activity, ATP plays a role in providing energy for
A) Cross-bridge cycling. B) Establishing ion gradients across the sarcolemmal membrane. C) Transporting Ca2+ back to the sarcoplasmic reticulum. D) All of the above
The ________ represents the minimum resting energy expenditures of an awake, alert individual.
Fill in the blank(s) with the appropriate word(s).
The cells in the nervous system that fill spaces and support neurons both
physically and nutritionally are called ______. Fill in the blank(s) with correct word
Which of the following is not a major muscle of the head?
a. Orbicularis oculi. b. Zygomaticus. c. Semimembranosus. d. Masseter.