Discuss the importance of calcium ions in skeletal muscle contraction
What will be an ideal response?
Calcium ions are necessary for myosin heads to attach to binding sites on actin filaments. As the action potential travels into the muscle cell, it stimulates the sarcoplasmic reticulum surrounding each myofibril to release its stored calcium ions into the sarcoplasm. The calcium ions trigger the binding of myosin heads to actin filaments and the initiation of the sliding of filaments.
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Which of the following statements accurately describe events that occur as a result of a local potential reaching threshold?
A. K+ channels begin to close. B. Activation gates of Na+ channels begin to close. C. A positive feedback cycle develops in which depolarization causes activation gates of Na+ channels to open. D. Inactivation gates of Na+ channels begin to open. E. Both "Inactivation gates of Na+ channels begin to open" and "A positive feedback cycle develops in which depolarization causes activation gates of Na+ channels to open" are correct.
Another term used to describe high blood pressure is ____________________.?
Fill in the blank(s) with correct word
Which two cells coordinate adaptive immunity?
A) T cells and B cells B) B cells and natural killer cells C) T cells and natural killer cells D) acute lymphocytes and chronic lymphocytes E) cytotoxic T cells and helper T cells
Hepatic Kupffer cells:
a. Degrade bilirubin b. Have round, euchromatic nuclei and a cuboidal-shaped cytoplasm c. Phagocytize dying red blood cells d. Store vitamin A e. Synthesize angiotensinogen