People who live in the north should take supplemental calcium with vitamin D. Explain why.
What will be an ideal response?
Vitamin D is manufactured by sunlight and is needed for absorption of dietary calcium. People who live in the north where the winter months are severe may need supplemental vitamin D because of the decreased amount of sunlight exposure.
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The eye begins to develop during the fourth week of embryonic development.
Answer the following statement true (T) or false (F)
Cervical mucus secreted under the influence of estrogen alone is clear and non-viscous, while that secreted under the influence of progesterone is thick and sticky.
Answer the following statement true (T) or false (F)
Where in the figure is spongy bone located?
a) A b) B c) E d) F e) G
Which is NOT a basic method of cell-to-cell communication?
A) mechanical signals B) cytoplasmic transfer of signals C) nerve and blood-transported signals D) contact-dependent signals E) diffused chemical signals