Page 147 - Biology_Form_3

Biology for Secondary Schools

Relay neurone Neurone that forms an intermediate link between
a sensory and motor neurone
Sacculus Sac like structure in the inner ear
Sclerotic layer (sclera) Dense connective tissue of the eyeball that
form the white part of the eye
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Sebaceous glands Glands situated in the dermis that secrete oily
fluid which prevents cracking of the epidermis

Secretion Substance released from a gland where it is
produced, usually into the blood

Sedative Drug that slows down the brain and cause
drowsiness
Semicircular canals Three tiny fluid filled tubes in the inner ear.
They are involved in body balance
Sensory neurone Neurone that conducts impulses from the sense
organs to the brain or spinal cord

Spinal cord Part of the central nervous system that serves
as an impulse conduction pathway; it also acts
as a reflex centre

Stimulant Drug that speeds up the action of the brain and
makes a person more alert
Stimulus Anything capable of causing a response in an
organism
Sweat glands Glands situated in the dermis that produce
sweat
Sweating Loss of liquid through glands on the surface
of the skin which cools the body when it
evaporates
Taste buds Group of receptor cells on the tongue that
detects food taste
Tendon Band of tough, inelastic fibrous tissue that
connects a muscle to the skeleton

Testosterone Male sex hormone produced mainly in the testes
that influences muscle mass, bone density, and
reproductive functions

Thyroxine Thyroid hormone that controls metabolism,
heart rate, and body temperature

140 Student’s Book - Form Three

BIOLOGY FORM 3 FINAL EDITED 16.09.2025.indd 140 23/10/2025 11:52:50 KAMISHNA
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BIOLOGY FORM 3 FINAL EDITED 16.09.2025.indd 140

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