Page 73 - Biology_Form_3

Biology for Secondary Schools

Hypothalamus

Pituitary gland
Thyroid gland
FOR ONLINE READING ONLY
Parathyroid gland

Pancreas

Adrenal gland

Ovary Testis

a b
Figure 3.1: Location of endocrine glands in (a) female (b) male

the thyroid gland to release thyroid (i) Oxytocin, which plays a key role
hormones that regulate metabolism. in childbirth by facilitating uterine
contractions and promoting milk
(ii) The corticotropin-releasing hormone ejection during breastfeeding.
(CRH) from the hypothalamus
stimulates the pituitary gland to (ii) Antidiuretic hormone (ADH), which
secrete adrenocorticotropic hormone helps regulate the body’s water
(ACTH), which directs the adrenal balance by influencing kidney function
glands to produce cortisol, a hormone and reducing urine production.
essential for stress adaptation. These hormones are produced in
the hypothalamus and stored in the
Neuroendocrine function posterior pituitary gland until they are

Certain hormones are synthesized by needed.
neurosecretory cells, forming a direct
link between the nervous and endocrine Rapid and sustained responses
systems. Examples include: A major distinction between the nervous
and endocrine systems lies in their speed

66 Student’s Book - Form Three

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BIOLOGY FORM 3 FINAL EDITED 16.09.2025.indd 66 KAMISHNA 23/10/2025 11:52:41 KAMISHNA