Muscle Biology

The largest and most efficient muscle is the diaphragm. The diaphragm is a large muscle that lies under the lungs and separates them from the organs below. As the diaphragm moves down or flattens, the ribs flare outward, the lungs expand and air is drawn in. This process is called inhalation or inspiration. It is attached to the spine, ribs and sternum and is the main muscle for respiration, playing a very important role in the breathing process.

Microfilaments are the thinnest filaments of the cytoskeleton, a structure found in the cytoplasm of eukaryotic cells. These linear polymers of actin subunits are flexible and relatively strong, resisting buckling by multi-piconewton compressive forces and filament fracture by nanonewton tensile forces.  

Myoglobin is an oxygen-binding protein found predominantly in red muscle fibers (slow-twitch fibers), which are specialized for sustained aerobic activity and endurance. These fibers appear red due to high myoglobin content and mitochondrial density. White muscle fibers (fast-twitch) rely on glycogen and have little myoglobin as they're meant for quick, anaerobic bursts.

The important organs of body, like heart, stomach and intestines are regulated by a part of the nervous system called the autonomic nervous system (ANS). The ANS is part of the peripheral nervous system and it controls many organs and muscles within the body.

Here the length of muscle remains the same, e.g. holding an object up without moving it. The muscular force approximately matches the load and thus no movement results.

It is a paired muscle lying at the lower end of the chin. It causes protrusion of the lower lip and elevates the skin of the chin. As the lower lip is raised, it results in elevation and wrinkling of the skin of chin.

Levator anguli oris is a deeply placed oral muscle originating from the maxilla that elevates the corner of the mouth. It aids in non-verbal communication as it helps the face in forming a well known expression, the smile.

This muscle surrounds the whole mouth. It is situated between the skin and the mucous membranes of the lips, stretching upward to the nose and down to the part between both the lips and chin. It is also called the kissing muscle of the body.

Each end of a cardiac muscle cell may link to two or more other cells, so that the fibrous structure of cardiac muscle seems to be branched unlike skeletal muscle, where each fibre is a single and discrete unit .

This is the correct option. Striated muscles are also known as striped, skeletal or voluntary muscles due to their properties.

This is the correct option as this statement is false. Smooth muscles are found in the stomach, intestines, walls of alimentary canal, etc, not in the muscles of limbs, body wall, face, neck, etc. The muscles of limbs, body wall, face, neck, etc. are striated muscles.

It is the longest muscle in the body. It is narrow and ribbon-like in a person's body. It is attached to the lower part of the hip.

It is the smallest and shortest of the three adductor muscles originating in the superior ramus of the pubis. It is a triangular muscle in the thigh. It acts to adduct and rotates the thigh laterally and to flex the leg.

This muscle originates from the ischiopubic ramus and ischial tuberosity of the femur. It rotates the femur. The ischiocondylar part of adductor magnus is an immobilize muscle by embryonic origin and action. So, it is innervated by the tibial nerve.

 Yes, it is correct. This happens because of deposition of lactic acid; produced by anaerobic respiration.