Put the following events of the contraction cycle in the order in which they occur. 1. Cross-bridge detachment 2. Cross-bridge formation 3. Active site exposure 4. Myosin reactivation 5. Calcium ions bind troponin 6. Myosin head pivoting
A) 5,3,6,2,1,4
B) 5,3,2,6,4,1
C) 5,3,2,6,1,4
D) 5,3,6,2,4,1
E) 3,5,2,6,1,4
C
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Which of the following is NOT true of the pineal gland?
A. It is located in the brain. B. It produces melatonin. C. It may be what triggers sleep at night. D. It causes the maturation of white blood cells.
Cody has always carefully controlled her caloric intake, and is lean. During her unplanned pregnancy, she continued to eat the same, hoping that taking prenatal vitamins and minerals would ensure that her fetus would grow normally. Her only complication during pregnancy was persistent constipation and consequent hemorrhoids. She gained only the minimum weight suggested by her doctor, and
delivered a healthy, full-term infant; her pre-pregnancy weight was rapidly reestablished. Propose an explanation for how she managed to gain enough weight, did not violate the law of conservation of mass, and for her only complication. What does this suggest about "eating for two" that some pregnant women do? What will be an ideal response?
Which feature is not characteristic of epithelial tissue?
A. Cells connected to each other by intercellular junctions B. Attachment to a basement membrane C. Polarity D. High regeneration capacity E. Large amount of extracellular matrix
Which arteries provide a good landmark for identifying the corticomedullary boundary?
A) cortical radiate arteries (interlobular arteries) B) interlobar arteries C) segmental arteries D) arcuate arteries