Science - Chapter 1: Grade 7

womp womp!! GL!

Which of the systems is the boss?

Which of the systems is the boss?

The nervous system

Name four systems that play a key role in moving materials through your body.

Your circulatory system, respiratory system, digestive system, and excretory system.

What are the two systems that work together to control body functions?

The nervous system and endocrine system.

Define what a joint is, and give 3 examples of what a joint is.

A joint is a place in the body where two bones come together. For example, your elbow, shoulder, and your wrist.

Explain how muscles move bones.

Muscles move bones because the nervous system tells the muscles to, and makes it contract and relax.

Why is ongoing stress unhealthy?

It disrupts homeostasis and disrupts your body’s ability to fight diseases. It can also cause depression, headaches, digestion problems, heart problems, and other health issues.

What are the four conditions in the body that are related to maintaining homeostasis?

Regulating temperature, meeting energy needs, maintaining water balance, and keeping your balance.

Draw the body organization chart:

Name 3 different body systems, and what structures are involved in those systems.

The Skeletal System: Bones, cartilage, ligaments, and tendons.

The Circulatory System: Heart and blood vessels.

The Nervous system: Brain, spinal cord, and nerves.

Cell

The basic unit of structure and function in a living thing.

Tissue

A group of similar cells that perform the same function.

Muscle tissue

Carries out movement, it can contract or shorten and make parts of your body move.

Nervous tissue

Directs and controls the process. It carries electrical messages back and forth between the brain and other parts of the body.

Connective tissue

Provides support for your body and connects all its parts. Ex: Bone tissue and fat tissue.

Epithelial tissue

Covers the surface of your body, inside and out. Some of them (such as your skin) protect the structures that lie beneath them.

Organ

A structure that is made up of different kinds of tissue. An organ performs a specific job.

Organ system

A group of organs that work together, carrying out major functions.

Skeleton

Includes all of the bones in your body.

Skeletal muscle

Attached to the bones of your skeleton and provides the force that moves your bones.

Joint

A place in your body where two bones come together.

Nutrient

A substance that you get from food and that your body needs to carry out processes, such as contracting muscles.

Absorption

A process by which nutrients move from the digestive system into the bloodstream.

Gland

What the endocrine system is made up of. Organs that release chemical signals directly into the bloodstream.

Stimulus

A signal in the environment that makes you react.

Response

What your body does in reaction to a stimulus.

Hormone

The chemical signals released by the endocrine system. They are transported through your body by the circulatory system.

Homeostasis

The condition in which an organism’s internal environment is kept stable in spite of changes in the outside environment. Keeping this balance is necessary for an organism to function properly and survive.

Stress

The reaction of your body to possibly threatening, challenging, or uncomfortable events.