Hypocalcemia causes muscle weakness, whereas hypercalcemia causes potentially fatal muscle tetanus
Indicate whether the statement is true or false
FALSE
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During hyperventilation, why do some people detect a tingling sensation in their hands and feet?
A) a decrease in carbon dioxide in blood B) an increase in carbon dioxide in blood C) widespread release of catecholamines D) hyperexcitability of afferent neurons E) a decrease in blood flow to the distal extremities
The biconcave structure of an erythrocyte is shaped to better accommodate the crystalline structure of hemoglobin
Indicate whether the statement is true or false.
A fertilized egg (embryo) attaches itself to the lining of the ____________ where the fetus develops.
Fill in the blank(s) with the appropriate word(s).
The yolk sac
A. is the fetal half of the placenta. B. becomes the umbilical cord vessels. C. provides nutrition until the placenta is formed. D. is the first site of blood cell formation.