Glossary


 

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S

Schwann cells

cells that make up the myelin sheath in a nerve cell


Sclera

the tough outer layer of the eye


Sebaceous glands

glands that secrete sebum (oily substance)


Seizure

physical display of violent cerebral disorder resulting from abnormal brain signalling


Semelparous

having one single reproductive episode in a lifetime


Sensory nerves

conduct nerve impulses from a structure or sensory organ towards the central nervous system


Septum

a partition that separates two chambers, as in the heart and nasal cavity


Simple epithelium

epithelium that consists of one layer of cells on a basement membrane


Sinoatrial node (SA node)

a small area of cells in the wall of the right atrium of the heart, where the electrical impulse is generated; also known as the natural pacemaker 


Sinus

an air-filled cavity in the skull; any blind-ending tract in a tissue



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