Which protein is found in cardiac muscle and type I skeletal muscle fibres, one of the two types of fibres that make up the muscles the body uses for movement?

Question

Question

This question was previously asked in

SSC JE Civil 15 Nov 2022 Shift 3 Official Paper

Answer 1

The correct answer is Myosin.Key Points

Myosin
- Myosin is found in cardiac muscle and type I skeletal muscle fibres, one of the two types of fibres that make up the muscles the body uses for movement.
- Myosins are a class of motor proteins well recognised for their functions in the contraction of muscles and a variety of other eukaryotic motility processes. They are ATP-dependent and in charge of motility based on actin.
- Wilhelm Kühne made the first myosin (M2) discovery in 1864. In order to maintain the tension condition in muscle, Kühne had isolated a viscous protein from skeletal muscle. He gave the protein the name myosin.
- Myosin is a vast superfamily of genes whose protein products share the fundamental traits of actin binding, ATP hydrolysis (ATPase enzyme activity), and force transduction, despite the fact that it was once believed that myosin was only found in muscle cells.

Additional Information

Cardiac muscle
- Cardiac muscle makes up the thick central layer of the heart (also known as myocardium). It is one of the three types of muscles in the body, along with skeletal and smooth muscle. The myocardium is encircled by an inner endocardium and a thin external layer called the epicardium, also called visceral pericardium.
- Despite some significant distinctions, cardiac muscle contracts similarly to skeletal muscle.
- The sarcoplasmic reticulum, a cell's internal calcium reserve, releases calcium in response to electrical stimulation in the form of a cardiac action potential.