Q. 35 - Biology

Question

How would muscle contractions be affected if ATP was completely depleted in a muscle fiber? 

Step-by-Step Solution

Answer

• Muscles would stay tightly constricted until more ATP was available for the myosin cross-bridge release since ATP is needed for myosin to release from actin. 
• For this reason, rigour mortis occurs in deceased animals.

Step : 1 ATP

• The energy used and stored by cells is derived from adenosine triphosphate (ATP).
• A nitrogenous base, a ribose sugar, and three serially bound phosphate groups make up the structure of ATP, which is a nucleoside triphosphate.
• When a cell needs energy, ATP can be taken out and utilized to fund processes or used to store energy for upcoming ones.

Step : 2 Muscle fibre

• One muscle cell makes up each fibre of muscle. They assist in regulating the bodily forces physically.
• Slow oxidative (SO), fast oxidative (FO), and quick glycolytic are the three different types of muscle fibre (FG).
• Myofibrils are a component of muscle fibres. Actin and myosin filaments make up the myofibrils.