Give the functions/role of the following structure/organs in our today:

i) Pineal gland ii) Cochlea

iii) Urethra

iv) Large intestine

v) Cholecystokinin-pancreozymin(CCK-PZ)

vi) Pyloric orfice

vii) Lungs

viii) Bundle of His ix) Major Histocompatability complex (MHC)

x) Platelets

i) Pineal gland -

The pineal gland has several critical functions including secretion of melatonin the hormone that causes sleepiness and regulation of certain endocrine functions. The gland also helps the body to convert signals from the nervous system to signals in the endocrine system.

Physiological Function

Physiologically, in conjunction with the hypothalamus gland, the pineal gland controls the sex drive, hunger, thirst and the biological clock which determines the body’s normal aging process.

The primary function is that pineal gland secretes melatonin. This hormone is the primary one that controls your sleepiness and wakefulness. Natural light tends to turn this gland on. When the pineal gland is activated, your brain moves from sleeping to a state of wakefulness. This process is sometimes referred to as the awakening of the “Third Eye” – a common name for the pineal gland.

ii) Cochlea - 

The cochlea is the auditory center of the inner ear, a fluid-filled organ that translates the vibrations of auditory sound into impulses the brain can understand. This occurs at the organ of Corti, a structure consisting of tiny hairs throughout the cochlea that vibrate and send electrical signals through the nervous system.

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