A. SR calcium ATPase pump B. Twitch duration 27. A. Twitch duration B. Action potential frequency required for fused tetanus 28. A. Follicular development B. Estrogen 29. A. Exercise intensity B. R.Q. 30. Hormone specificity depends entirely on whether the cell has a receptor for the hormone.
Ovulation requires a positive feedback by estrogen acting at the anterior pituitary.
TSH inhibits iodide uptake into thyroid. The thymus is important in T lymphocyte development. The variability in the menstrual cycle is generally caused by a varied luteal phase. Resting tension in skeletal muscle is primarily due to the protein titin. The adenylate kinase and creatine kinase reactions generate cell ATP anaerobically.