Explain how Ca2+ levels inside myocardial cells are altered.
What will be an ideal response?
Calcium enters the cell through voltage-gated calcium channels in the cell membrane. Calcium ions then open ryanodine receptor channels in the sarcoplasmic reticulum, resulting in calcium-induced calcium release. Calcium ions are transported back into the SR by a calcium ATPase, or removed from the cell by a sodium-calcium antiport protein.
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Which of the following are among the top four most common elements in the human body?(Select all that apply.)A) CarbonB) SulfurC) OxygenD) Phosphorus
What will be an ideal response?
The multiple nuclei in skeletal muscle cells are the result of the
A. action of testosterone on mesenchyme cell. B. fusion of myoblasts. C. cytokinesis of embryonic satellite cells. D. stimulation of fibroblasts by hormones. E. spontaneous development of nuclei in embryonic cells.
Which of the following helps return blood to the heart?
A) Positive intrathoracic pressure B) Contracting skeletal muscles C) Capillary action D) Valves in the arteries
A transverse plane can also be called a horizontal plane.
Answer the following statement true (T) or false (F)