Muscle cells can store oxygen using the pigment ________.
A. hemoglobin
B. actin
C. myosin
D. None of the choices are correct.
Answer: D
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There is a legend about an autopsy having been performed on a space alien in New Mexico, many decades ago. Assuming that this alien was as well-educated and trained on its planet as NASA educates and trains astronauts on Earth, what feature would be expected in the alien's brain?
A) at least 12 pairs of cranial nerves B) a thick band of fibers connecting right and left hemispheres C) a system of fluid-filled cavities deep in the brain D) glandular structures resembling the pineal and pituitary E) an enlarged area with surface grooves and folds
During fetal development, the vagina forms from the ________ sinus.
Fill in the blank(s) with the appropriate word(s).
Chondroblasts produce
A. synovial fluid. B. ligaments. C. blood cells. D. bone tissue. E. cartilage matrix.
Which of the following are primarily responsible for maintaining the salinity gradient of the renal medulla?
A) Collecting ducts B) Proximal convoluted tubules C) Cortical nephrons D) Distal convoluted tubules E) Juxtamedullary nephrons