Muscle Biology

The myosin filament has meromyicin and it has two important parts, a globular head and a tail. The globular head has the site for ATPase enzyme and has binding sites for ATP and active sites for actin.

Muscular energy is derived from the chemical energy stored in molecules like ATP, which is released through metabolic processes.

Food provides the chemical energy that our bodies convert into muscular and other forms of energy through metabolic processes.

The bundle of His is a group of muscle cells that transmits the electrical impulses from AV node to the ventricle wall via Purkinje fibres. 

A muscle is rich in protein. The muscle cells contain protein filaments of actin and myosin. Actin is a thin filament and myosin is a thick filament. These protein filaments slide past one another to produce contraction. This results in change in length and shape of the cell.

Non-striated muscles are called as smooth muscles. Their activities are not under the voluntary control of the nervous system and are therefore known as involuntary muscles. They are called as visceral muscles because they line the blood vessels, stomach, digestive tract and other internal organs. So, the correct answer is option D. 

Calcium ions play a significant role in the muscle contraction. These activate the interaction of myosin and actin, through the intervention of tropomyosin and troponin.
Magnesium, in muscle contraction, stimulates calcium re-uptake by the calcium-activated ATPase of the sarcoplasmic reticulum. It also affects the translocation of calcium ions through the smooth muscle cell membrane.

Multi unit smooth cells, however, are not electrically coupled and hence, the cells must be stimulated separately. These smooth muscles contain few gap junctions, and therefore contractions do not spread from cell-to-cell as in single-unit smooth muscle. Each cell is therefore situated close to an axon terminal where it can easily make contact with a neurotransmitter. As the cells are not electrically coupled the force of contraction can be controlled by the number of contractile muscle fibres. Multi-unit smooth cells can be found in the in the trachea, the large elastic arteries, the iris of the eye, in the lungs, erectile tissues of hair follicles ( Arrector pili of the dermis) and the vas deferens in the male genital tract.
The response of the whole muscle depends on upon the number of motor units active, the frequency of discharge in the fibers and the relative amount of excitatory and inhibitory input. Multi-unit smooth muscle activity can be initiated by hormones, but it is not much affected by rapidly stretching the muscle.

Most of the skeletal muscles are attached to the bone on their ends by tendons. As the muscles contract, a force is exerted on the bones, which helps to support and move our body along with its appendages. Usually, one end of the muscle is fixed in its position, while the other end moves during contraction.
The "origin" is the attachment site that doesn't move during contraction, while the "insertion" is the attachment site that does move when the muscle contracts. The insertion is usually distal, or further away, while the origin is proximal, or closer to the body, relative to the insertion. "Belly" of muscle is between origin and insertion.

Visceral muscles are located in the inner walls of hollow visceral organs of the body like the alimentary canal, reproductive tract, etc. Each spindle-shaped smooth muscle fiber contains a single, central nucleus. They do not exhibit any striation and are smooth in appearance. Hence, they are called smooth muscles (non-striated muscle). Their activities are not under the voluntary control of the nervous system and are therefore known as involuntary muscles. They assist, for example, in the transportation of food through the digestive tract and gametes through the genital tract.

Muscular strength usually refers to the "ability to exert a force on an external object". The strongest muscle in humans, based on its weight is the masseter muscle or the jaw muscle. It is the muscle that can generate the largest externally measurable force attributable to the action of a specific, single muscle. Its strength is the result of incredibly densely packed muscle fibers combined with being attached to a short-armed lever. With all muscles of the jaw working together it can close the teeth with a force as great as 55 pounds (25 kilograms) on the incisors or 200 pounds (90.7 kilograms) on the molars.

Striated and unstriated are the types of muscles. Skeletal muscles are closely associated with the skeletal components of the body like limbs. They have a striped appearance under the microscope and hence, are called striated muscles. As their activities are under the voluntary control of the nervous system, they are known as voluntary muscles too. They are primarily involved in locomotory actions and changes of body postures. 

Epimysium is the outermost white fibrous connective tissue that completely surrounds and encases skeletal muscle. It is composed of dense irregular connective tissue. The most important biological purposes of this layer are protection from strain and friction. The smoothness of the tissues promotes seamless gliding, and also protect joints and other high-impact areas from rips or tears and promotes smooth movement of the limbs and joints.

The gluteus maximus (also known as glutus maximus or, collectively with the gluteus medius and minimus, the glutes) is the largest and most superficial of the three gluteal muscles. It makes up a large portion of the shape and appearance of the hips. It permits a variety of motion and allows us to sit upright.

myosin filament is a polymerised protein. Many monomeric proteins, called meromyosin constitute one thick filament. Each meromyosin has two important parts, a globular head with a short arm and a tail, the former being called the heavy meromyosin (HMM) and the latter, the light meromyosin (LMM). The HMM component, i.e., the head and short arm projects outwards at regular distance and angle from each other from the surface of a polymerised myosin filament and are known as the cross arm. The globular head is an active ATPase enzyme and has binding sites for ATP and active sites for actin.