Which of the following is not a role of calcium in the body?
It participates in muscle contraction.
It is a significant component of nucleic acids.
They serve as second messengers.
It activates exocytosis.
It is important in blood clotting.
The Correct Answer is B
A. It participates in muscle contraction: Calcium binds to troponin, enabling contraction.
B. It is a significant component of nucleic acids: Calcium is not a structural part of DNA or RNA; phosphate is.
C. They serve as second messengers: Calcium ions act as second messengers in various signaling pathways.
D. It activates exocytosis: Calcium triggers neurotransmitter and hormone release by promoting vesicle fusion.
E. It is important in blood clotting: Calcium is essential for several steps in the coagulation cascade.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Transverse colon: The transverse colon is the horizontal portion of the large intestine that runs across the upper abdomen from the right colic flexure (near the liver) to the left colic flexure (near the spleen).
B. Ascending colon: The ascending colon runs vertically upward along the right side of the abdomen, from the cecum to the hepatic flexure.
C. Descending colon: The descending colon runs vertically down the left side of the abdomen, from the splenic flexure to the sigmoid colon.
D. Ileum: The ileum is the final section of the small intestine, located in the lower abdomen, and connects to the cecum.
Correct Answer is C
Explanation
A. Right common iliac artery:
Arises from the abdominal aorta; bifurcates into internal and external iliac arteries.
B. Right internal iliac artery:
Supplies pelvic organs; branches off the common iliac artery.
C. Left common iliac artery:
The left-side counterpart of the right common iliac.
D. Abdominal aorta:
Major artery running down the midline; bifurcates into the common iliac arteries around L4.
E. Right external iliac artery:
Continues into the femoral artery; runs along the pelvic brim.
F. Right femoral artery:
Located in the thigh, distal to the inguinal ligament; often seen in lower limb images.
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