Describe a motor unit. How many fibers does a muscle unit contain?
What will be an ideal response?
A motor unit consists of all the skeletal muscle fibers controlled by a single motor neuron. They may have as few as 4-6 fibers (eye muscles) or as many as 1000-2000 (leg muscles).
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Label B represents which of the following structures?
A) hilum
B) renal pelvis
C) renal cortex
D) renal medulla
E) renal sinus
Homeostatic control systems and acclimatization are examples of biological adaptations
Indicate whether the statement is true or false.
The process of spermatogenesis from primary spermatocyte to sperm:
A. takes about three weeks in the human. B. occurs when a male is an embryo, ceasing at birth. C. requires participation of Sertoli cells. D. occurs in the epididymis. E. occurs as the cells gradually travel between two closely attached Leydig cells.
The primary motor cortex is located in the ________ lobe.
A. frontal B. parietal C. temporal D. occipital