Which of the following become connected by myosin cross-bridges during muscle contraction?
A) thin filaments and thick filaments
B) thick filaments and titin filaments
C) z disks and actin filaments
D) thick filaments and t-tubules
E) thin filaments and t-tubules
A) thin filaments and thick filaments
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In the condition diabetes mellitus, why does glucose appear in the urine?
A. Without insulin, the glomerular filtration barrier becomes extremely leaky to glucose, which is not normally filterable. B. The plasma concentration of glucose becomes so high that it diffuses from peritubular capillaries into the proximal tubule, down its concentration gradient. C. The rate of tubular secretion of glucose becomes greater than the sum of glucose filtration and reabsorption. D. The filtered load of glucose becomes greater than the tubular maximum for its reabsorption. E. Without the hormone insulin, glucose cannot enter proximal tubule epithelial cells.
The infancy stage of life is considered to be over at
A) 3 months B) age 2. C) 6 months. D) 1 month. E) 18 months.
Which of the following is a function of synovial fluid?
A) reduce friction B) nourish the chondrocytes C) act as shock absorbers D) provide lubrication E) All of the answers are correct.
When hemoglobin molecules are decomposed, a greenish pigment called
_____________ is formed. Fill in the blank(s) with correct word