In this Grade 7 Life Science lesson from Chapter 17, students learn how the human body is organized into five levels — cells, tissues, organs, organ systems, and the organism — and explore the four types of tissues: epithelial, nerve, muscle, and connective. The lesson also introduces key vocabulary including homeostasis and explains how organ systems work together to maintain the body's functions.
Section 1
Bodies Build Organization From Cells to Systems
The human body organizes itself in five increasing levels: cells (basic units of life), tissues (similar cells working together), organs (different tissues combined), organ systems, and the complete organism.
Section 2
Tissues Perform Specialized Functions Throughout the Body
Four main tissue types work in our bodies: epithelial tissue forms boundaries, nerve tissue carries messages, muscle tissue creates movement, and connective tissue provides support and protection.
Section 3
Organ Systems Maintain Balance Through Homeostasis
Organ systems work together to maintain homeostasis, regulating conditions like body temperature and blood sugar levels even when external conditions change, ensuring survival of the organism.
Section 4
Bodies Meet Survival Needs Through Multiple Systems
The human body requires air, water, food, and stable temperature to survive. Various organ systems work together to process these resources and protect the body from environmental challenges.
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
Bodies Build Organization From Cells to Systems
The human body organizes itself in five increasing levels: cells (basic units of life), tissues (similar cells working together), organs (different tissues combined), organ systems, and the complete organism.
Section 2
Tissues Perform Specialized Functions Throughout the Body
Four main tissue types work in our bodies: epithelial tissue forms boundaries, nerve tissue carries messages, muscle tissue creates movement, and connective tissue provides support and protection.
Section 3
Organ Systems Maintain Balance Through Homeostasis
Organ systems work together to maintain homeostasis, regulating conditions like body temperature and blood sugar levels even when external conditions change, ensuring survival of the organism.
Section 4
Bodies Meet Survival Needs Through Multiple Systems
The human body requires air, water, food, and stable temperature to survive. Various organ systems work together to process these resources and protect the body from environmental challenges.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter