GENERAL HISTOLOGY

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CONNECTIVE TISSUE GLAND

ENDOCRINE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The endocrine glands are ductless glands. Therefore, the hormones are secreted directly into the blood flow. Although the hormones are transported throughout the body in the blood, the hormones only influence and affect specific target cells because
A
The hormones have specific molecule receptors
B
The target cells have specific molecule receptors on its membrane surface
C
The walls of blood capillaries are only permeable to a certain type of hormone
D
The hypothalamus controls the hormone to be transported to the target cell
Explanation: 

Detailed explanation-1: -The endocrine glands secrete hormones into the surrounding interstitial fluid; those hormones then diffuse into blood and are carried to various organs and tissues within the body. The endocrine glands include the pituitary, thyroid, parathyroid, adrenal glands, gonads, pineal, and pancreas.

Detailed explanation-2: -The endocrine gland is called the ductless glands because there are no ducts in the glands. The products such as hormones are secreted and goes directly to the bloodstream. So there is no need for glands to collect and distribute the products, it just goes straight to the blood.

Detailed explanation-3: -The endocrine glands do not have ducts to carry their product to a surface. They are called ductless glands.

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