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Use the drop-down menus to determine which structures of the endocrine system are described below.

connects the endocrine system to the nervous system

called the “master gland” of the endocrine system

secretes a hormone that regulates sleep cycles

regulates the development and differentiation of T lymphocytes

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BioWizard

• Hypothalamus-connects the endocrine system to the nervous system.

It is a structure within the brain which secretes the hormones – releasing hormones which than stimulate or inhibit the secretion of hormones from the pituitary gland.

• Pituitary gland (hypophysis) - called the “master gland” of the endocrine system  

It is a three-lobe endocrine gland: The anterior pituitary (regulates growth, stress, reproduction), intermediate lobe (secretes melanocyte-stimulating hormone) and posterior pituitary (connection to the hypothalamus).

• Pineal gland - secretes a hormone that regulates sleep cycles.

Pineal gland is located in the epithalamus and it secretes melatonin hormone that regulates circadian and seasonal cycles.

• Thymus - regulates the development and differentiation of T lymphocytes

Thymus is a lymphoid organ of the immune system where the T lymphocytes mature.


The messenger system that releases the hormones to the bodily organs and helps in the functioning of the tissue, organs and cells along with all the biological processes is called the endocrine system.

The correct dropdowns for the structures of the endocrine are the hypothalamus, pituitary gland, pineal gland and thymus.

The structures of the endocrine system can be explained as:

  • The structure situated within the brain is called the hypothalamus and connects the endocrine to the nervous system. It releases certain hormones which inhibit or stimulate the pituitary hormone secretion.

  • The master gland of the endocrine is the pituitary and is a three-lobed structure that regulates growth, reproduction, skin colouration, and connects to the hypothalamus.

  • The sleep cycle is regulated by the secretion of pineal glands that releases melatonin that controls the seasonal and circadian cycles.

  • The growth and the differentiation of the T lymphocytes are controlled by the thymus and is a part of the immune system that fights pathogens and maintains the body immunity.

Therefore, the correct dropdowns are the hypothalamus, pituitary gland, pineal gland and thymus.

Learn more about the structures of the endocrine system here:

https://brainly.com/question/3534540

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