Key Terminology (Grade 12 NSC Matric Life Sciences): Flashcards
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Homeostasis
Homeostasis
Maintaining stable internal conditions despite external changes
Hormones
Hormones
Chemical messengers travelling through bloodstream
Negative feedback
Negative feedback
Detects imbalance & triggers response to restore normal
Endocrine system
Endocrine system
Network of glands producing & releasing chemical messengers
Thermoregulation target temp.
Thermoregulation target temp.
Approximately 37°C
Antagonistic hormones
Antagonistic hormones
Hormones working in opposite ways (e.g. insulin & glucagon)
Vasoconstriction function
Vasoconstriction function
Narrowing blood vessels to reduce heat loss
Vasodilation function
Vasodilation function
Widening blood vessels to increase heat loss
Exocrine glands key feature
Exocrine glands key feature
Have ducts carrying secretions to specific locations
Endocrine glands key feature
Endocrine glands key feature
No ducts; release hormones directly into bloodstream