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Ghrelin is widely expressed but primarily in the stomach in the adults. Ghrelin acts centrally to stimulate growth hormone secretion and food intake, and peripherally to regulate energy homeostasis.
Ghrelin is a hormone that increases appetite, and also plays a role in body weight.

Our body is made up of a single cell called the zygote.

The cytoplasm continuously divides into embryos of cells that differ in shape, size, and content.

Embryonic cells gradually change in structure and function. This process is called cell differentiation.

Epithelial Tissue – envelops and protects the body, covering the lining of the esophagus.

Nervous system – regulates and coordinates bodily functions and helps to recognize and respond to changes inside and outside the body.

Muscular tissue – Enables body movement.

Connective tissue – connects or supports other art forms.

In an atom, number of protons and electrons are same. Hence, the number of electrons present in the atom will be 18 as there are 18 protons present.

Cushing’s syndrome is the collection of signs and symptoms due to prolonged exposure to glucocorticoids such as cortisol. Signs and symptoms may include high blood pressure, abdominal obesity but with thin arms and legs, reddish stretch marks, a round red face, a fat lump between the shoulders, weak muscles, weak bones, acne, and fragile skin that heals poorly.

It the total force acting on the object is zero then the forces is called Balanced force.
If two individual forces are of equal magnitude and opposite direction, then the forces are said to be balanced.
An object is said to be acted upon by an unbalanced force only when there is an individual force that is not being balanced by a force of equal magnitude and in the opposite direction.
Blanced force cannot move an object from motion to rest or rest to motion.

Inertia is the inability of an object to change its own state of motion or motion.

Inertia is of two kinds,

Motion inertia
Static inertia

Motion inertia is the tendency of an object in motion to remain in motion or to change its motion.

E.g., a runner cannot finish the race as soon as he reaches the finish point.

Static inertia is the tendency of a stationary object to remain in its still state or its inability to change its stationary state.

For example, when the horn of a mango tree is shaken, the mango falls off when it starts to move.

The inertia of an object depends on its mass. Inertia increases as mass increases.

Impulse force is a large force applied for a short time.

Impulse = force x time

Avogadro was an Italian scientist, most noted for his contribution to molecular theory now known as Avogadro’s law, which states that equal volumes of gases under the same conditions of temperature and pressure will contain equal numbers of molecules.

Human immunodeficiency virus infection and acquired immune deficiency syndrome (HIV/AIDS) is a spectrum of conditions caused by infection with the human immunodeficiency virus (HIV).
There are three main stages of HIV infection: acute infection, clinical latency, and AIDS.

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