MEDICAL PHYSIOLOGY

PHYSIOLOGY

SYNAPTIC PHYSIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What molecule provides muscles with the energy required for contraction to occur?
A
ADP
B
ADP-ATP complex
C
ADP hydrolysis
D
ATP
Explanation: 

Detailed explanation-1: -Muscles need energy to produce contractions (Fig. 6). The energy is derived from adenosine triphosphate (ATP) present in muscles. Muscles tend to contain only limited quantities of ATP.

Detailed explanation-2: -During contraction, the creatine phosphate breaks into creatine and releases phosphorous which combine with ADP to form ATP. The ATP formed is used up by the muscles for contraction.

Detailed explanation-3: -ATP enables the actin-myosin cross-bridge to detach, and release energy through its hydrolysis to enable the myosin head to return to its normal position.

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