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Endocrine System: Thyroid Gland and Hormones

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Endocrine System: Thyroid Gland and Hormones

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Questions and Answers

What is the effect of GROUP 3 on the chief cells?

Stimulates the activity of the chief cells

Has no effect on the chief cells

Suppresses the activity of the chief cells (correct)

Increases calcium levels in the blood

What is the primary mechanism of hormone regulation?

Positive feedback

Hormonal stimuli

Humoral stimuli

Negative feedback (correct)

What is the role of the hypothalamus in hormone regulation?

Controls the adrenal glands

Regulates the thyroid gland

Secretes releasing hormones (correct)

Produces pituitary hormones

What triggers the release of more hormones in negative feedback?

Low hormone levels in the blood or a stimulus Signup and view all the answers

What is an example of hormone regulation by positive feedback?

Production of oxytocin during labor and childbirth Signup and view all the answers

What are the three mechanisms by which endocrine glands are stimulated to synthesize and release hormones?

Humoral, hormonal, and neural stimuli Signup and view all the answers

What primarily regulates the secretion of insulin by the B cells?

The level of glucose in the blood Signup and view all the answers

What is the function of glucagon secreted by the A cells?

To increase blood sugar levels Signup and view all the answers

What is produced and secreted by the D cells?

Somatostatin Signup and view all the answers

What is the function of somatostatin?

To regulate the secretion of other hormones Signup and view all the answers

What is the function of the islets of Langerhans?

To regulate glucose metabolism Signup and view all the answers

What is the shape of the cells of the islets of Langerhans?

Polygonal Signup and view all the answers

Which type of hormones are produced by endocrine glands excluding the gonads and adrenal cortex?

Amino acid hormones Signup and view all the answers

What is the primary mechanism controlling hormone production?

Negative feedback mechanism Signup and view all the answers

Why are endocrine glands referred to as 'ductless glands'?

Because they secrete hormones directly into the bloodstream Signup and view all the answers

What determines the target tissue for a specific hormone?

The presence of specific receptors on cells Signup and view all the answers

What is the function of the posterior pituitary?

To store and release hormones produced by the hypothalamus Signup and view all the answers

What is the name of the part of the pituitary gland that is glandular tissue?

Anterior pituitary Signup and view all the answers