In this Grade 7 Life Science lesson from Chapter 20, students explore how the endocrine system regulates body conditions through hormones, the chemical messengers that travel through the bloodstream to trigger responses in target cells. Students learn the roles of key glands — including the pituitary, thyroid, and adrenal glands — and how hormones like adrenaline, insulin, and thyroxine perform specific functions in the body. The lesson also introduces feedback mechanisms and how the endocrine system works alongside the nervous system to maintain homeostasis.
Section 1
Hormones Deliver Messages Throughout the Body
Chemicals made in one organ travel through blood to target cells, causing specific functions. These messengers control hormone production, regulate chemical balances, and respond to environmental changes without conscious control.
Section 2
Glands Produce Chemicals That Control Body Functions
The endocrine system consists of specialized glands like the pituitary, thyroid, and adrenal glands. Each produces specific hormones that regulate processes like growth, metabolism, and responses to stress.
Section 3
Feedback Mechanisms Maintain Body Balance
The body uses negative feedback to turn off hormone production when levels are sufficient. Positive feedback creates increasing responses for extreme conditions like blood clotting. These systems help maintain homeostasis.
Section 4
The Body Regulates Temperature Through Energy Transfer
The hypothalamus controls body temperature by managing heat transfer through four methods: evaporation (sweating), radiation (heat waves), conduction (direct contact), and convection (air movement).
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter
Expand to review the lesson summary and core properties.
Section 1
Hormones Deliver Messages Throughout the Body
Chemicals made in one organ travel through blood to target cells, causing specific functions. These messengers control hormone production, regulate chemical balances, and respond to environmental changes without conscious control.
Section 2
Glands Produce Chemicals That Control Body Functions
The endocrine system consists of specialized glands like the pituitary, thyroid, and adrenal glands. Each produces specific hormones that regulate processes like growth, metabolism, and responses to stress.
Section 3
Feedback Mechanisms Maintain Body Balance
The body uses negative feedback to turn off hormone production when levels are sufficient. Positive feedback creates increasing responses for extreme conditions like blood clotting. These systems help maintain homeostasis.
Section 4
The Body Regulates Temperature Through Energy Transfer
The hypothalamus controls body temperature by managing heat transfer through four methods: evaporation (sweating), radiation (heat waves), conduction (direct contact), and convection (air movement).
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter