Question 4 pts Which of the following is true about Ca2+ in muscle cell signalin

Question

Question 4 pts Which of the following is true about Ca2+ in muscle cell signaling? O It is normally found in high concentration in the sarcoplasmic reticulum O It binds to tropomyosin O A Ca2+ pump helps to maintain the normal or resting" Ca2+ gradient. O It is normally found in high concentration in the cytosol O It acts as a second messenger O It's presence in the cytosol will allow cross- bridge formation. DQuestion 5 1 pts In the sliding filament mode... O actin decre ases in length to allow sarcomere O actin binds ATP to help the sarcomere "relax" Myosin will return to the low-energy position after it releases ADP and Pi O O the myosin heads must use energy released from ATP hydrolysis to change shape into the high energy position O the myosin head will bind actin with or without Ca2+

Explanation / Answer

4. Ca2+ act as a second messenger in muscle cell signalling

5. In sliding filament theroy myosin heads bind to actin with or without Ca2+

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