Give two morphological characteristics of erythrocytes. Why is each advantageous to the cell?
What will be an ideal response?
Lack of a nucleus and the biconcave shape contribute to flexibility for moving through narrow capillaries and disk shape which aides in responding to osmotic changes.
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The gelatinous material that gives the eyeball its basic shape is the
A) vitreous humor. B) aqueous humor. C) ora serrata. D) perilymph. E) posterior cavity.
The external urethral orifice is found at the _________ of the penis
A. bulb B. crus C. glans D. corpus cavernosum E. body
The serous membranes that surround the lungs are called the
A. mucous membranes. B. synovial membranes. C. pleural membranes. D. peritoneal membranes. E. pulmonary membranes.
Which hormones are involved in long-term regulation of hunger?
A. Ghrelin and CCK B. Insulin and PYY C. Leptin and CCK D. Leptin and insulin