Which of the following statements is true regarding the mechanism controlling movement of white blood cells into damaged areas?
A. White blood cells exit the capillary and move through the tissue spaces with cytoplasmic extensions by following a trail of chemicals produced by other white blood cells.
B. Capillaries break open, flooding a damaged area with white blood cells.
C. The damaged tissues synthesize their own white blood cells.
D. None of the statements are true.
Answer: A. White blood cells exit the capillary and move through the tissue spaces with cytoplasmic extensions by following a trail of chemicals produced by other white blood cells.
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The opening of the neural tube that is closest to the future head is the
A. anterior neural fold. B. cranial neuropore. C. rostral neural groove. D. caudal neural canal. E. neural crest aperture.
Renal compensation for acidosis results in
A. urine with a high pH and an elevation of blood bicarbonate levels. B. urine with a high pH and a decline of blood bicarbonate levels. C. urine with a low pH and an elevation of blood bicarbonate levels. D. urine with a low pH and a decline of blood bicarbonate levels.
From your study of images of the lower limb muscles, what is a retinaculum?
A. A layer of dense connective tissue surrounding a muscle B. A group of muscles with a common insertion C. A band of connective tissue that holds a group of tendons in place D. A group of tendons running in the same direction E. A group of muscles with a common action
Which of the following statements is true?
A) Active processes require ATP. B) Passive processes move molecules against a concentration gradient. C) Active processes move molecules along a concentration gradient. D) Passive processes require ATP.