Examination of a sample of cells reveals large numbers of mitochondria compared to most other cells. Which of the following is a likely reason for this?
A) The cells produce digestive enzymes.
B) The cells produce steroid hormones.
C) The cells have very high energy requirements.
D) The cells synthesize transport proteins.
E) The cells make antibodies.
C) The cells have very high energy requirements.
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Calcitonin ____________________.
regulates energy production in the muscles cells reduces glucose levels in the blood lowers calcium ion concentrations in the blood increases calcium concetration is the blood None of the choices are correct
What would detect a tiny insect crawling across your skin?
A. Myoepithelial cells B. Hair receptors C. Piloerector muscles D. Dendritic cells E. Keratinocytes
The epiglottis opens the glottis during the swallowing reflex
Indicate whether the statement is true or false
The work of breathing normally requires about 3% of total energy expenditure; this increases under all of the following situations except when
a. elastic recoil decreases b. resistance increases c. the partial pressure of oxygen increases in the air d. ventilation increases e. compliance decreases