What is the physiological importance of the fact that the male testes descend to reside in the scrotal sac?
What will be an ideal response
The male testes descend into the scrotal sac so that a fairly constant intrascrotal temperature is maintained. Failure of the testes to descend results in sterility, because production of viable spermatozoa requires a temperature several degrees lower than normal body temperature.
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When an osteoblast becomes completely surrounded by its own matrix secretions it is referred to as an ________
A) osteogenic cell B) chondrocyte C) osteoclast D) osteocyte
Which renal tubule segment runs from the nephron loop to the collecting duct?
a) vasa recta b) distal convoluted tubule c) juxtaglomerular apparatus d) proximal convoluted tubule
Which of the following is INCORRECT about the numbers of spinal nerves?
A) 5 pairs of sacral spinal nerves B) 12 pairs of thoracic spinal nerves C) 7 pairs of cervical spinal nerves D) 5 pairs of lumbar spinal nerves
In a gomphosis, a tooth is held in place by fibrous structures known as ________ membranes.
Fill in the blank(s) with the appropriate word(s).