Oxygen forms covalent bonds with two atoms of hydrogen to form H2O (water). How many electrons are found in oxygen's outer shell?
A. 4
B. 1
C. 8
D. 6
E. 2
Answer: D
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For relaxation to occur,
A. calcium leaves the sarcoplasmic reticulum, and troponin binds calcium and blocks the binding sites on actin. B. calcium enters the myofibril, it detaches from myosin, and the binding sites on myosin become inactive. C. sarcoplasm calcium levels fall, calcium is removed from troponin, and tropomyosin blocks binding sites on actin. D. extracellular calcium levels fall, calcium is pumped into the myofibril, and tropomyosin slides away from actin.
What analogy is used by the text to describe a hormone and the associated receptor?
What will be an ideal response?
The function of the chordae tendineae and papillary muscles is to hold the AV valves wide open during diastole to ensure complete ventricular filling
Indicate whether the statement is true or false
Fast fibers
A) Have high resistance to fatigue B) Have a low concentration of myoglobin C) Have many mitochondria D) Produce powerful contraction E) Both B and D