Most of the iron that is removed from degraded hemoglobin is
A) excreted by the kidneys.
B) excreted by the liver.
C) excreted by the intestines.
D) recycled to the red bone marrow.
E) stored in yellow bone marrow.
D
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Direct intercellular communication involves
a. communication through gap junctions b. communication through direct linkups via surface markers c. extracellular chemical messengers d. (a) and (b) above e. all of the above
Match the artery with the appropriate description.A. Supplies blood to the diaphragmB. Supplies blood to the esophagusC. Supplies blood to the thoracic wallD. Supplies blood to the pancreas and small intestineE. Supplies blood to the stomach, liver, and spleenThoracic visceral artery
Fill in the blank(s) with the appropriate word(s).
Skeletal muscles must be stimulated by nerve impulses to contract.?
Indicate whether the statement is true or false
Which of the channels shown in the figure opens and closes randomly?
a) A b) B c) C d) D e) All of these choices