The Sum of All Parts:Human Body Systems

WEEKLY GOAL!Catalyst

Why do you get hungry? What happens when you get very cold? Why?

Why do you use the restroom more when you drink a lot of liquid?

Write in complete sentences!

Don’t talk during the Catalyst!

Objectives

By the end of today, all SWBAT… Identify the functions of the major body systems

Define homeostasis

Agenda

Catalyst Review New Unit: Body Systems! Scavenger Hunt HOMEOSTASIS Memory & Dominoes Exit Question

HOMEWORK: Body Systems Overview

Catalyst Review

Why do you get hungry? You’re running low on energy and need to

replace your nutrients back to normal. What happens when you get very cold?

Why? You start shivering to generate heat to get your

body temperature back to normal. Why do you use the restroom more

when you drink a lot of water? Because your body needs to get rid of the extra

water so that your fluid level goes back to normal.

New Unit: Human Body Systems & Health This week, we are going to talk about…

How we breathe, how our heart works How we digest food

But we’ll also learn about… How we gain and lose weight Why exercise is ESSENTIAL!!!!! How humans interact with bacteria & viruses How we fight off disease SEX!!! (especially STIs and pregnancy)

Body Systems

Key Point #1: Your body is organized in this order: cells organs organ systems

Your body is made of cells. Sometimes, a group of cells is called tissue

(such as heart tissue instead of heart cells). Organ = group of similar cells that do a

job Organ system = organs that work

together to accomplish a job

A Nerve Cell

Nerve Cells (AKA tissue)

Organ: the brain

The Nervous System

Small Intestine Cell

Small Intestine Cells (tissue)

Small Intestine

The Digestive System

Check for understanding!!!!

The smallest unit of living things is the ________.

Order these from smallest to largest: organ, organ system, cell.

Describe an organ.

Describe an organ system.

Organ System Structures & Functions Organ systems are specialized –

they have a specific function.

TEXTBOOK SCAVENGER HUNT!!

Let’s check ouranswers.

Supports the body and protects organsUses energy to produce movementControl center; coordinates communcationDistributes nutrients; removes wastesExchanges gases—oxygen in, CO2 outBreaks down food and absorbs nutrientsProduces hormones

Outside barrier and regulates temperature Eliminates liquid wastes

Provides ability to make/have childrenProtects the body from disease

Nervous SystemEndocrine SystemExcretory SystemMuscular SystemReproductive

SystemIntegumentary SystemSkeletal System

Immune System

1. Skeletal System2. Muscular System3. Nervous System4. Circulatory

System5. Respiratory

System6. Digestive System

BonesmusclesControl

centerPumps

bloodbreathingFood for

energy

7. Endocrine System8. Integumentary

System

9. Excretory System10.Reproductive

System11.Immune System

hormonesskinpeeingMaking

childrenFights

disease

But what’s the point?

All of your body systems work together to do ONE THING…

Homeostasis

Key Point #2: Homeostasis is the process of maintaining a stable internal environment. Stable = does not change (normal, even,

balanced) To function properly, your body needs to have a

stable… Oxygen level Temperature Food intake Amount of water

KEEP THIS CONCEPT IN MIND ALL UNIT LONG. Every body system works to keep your internal environment stable.

Examples

How does your integumentary system maintain homeostasis? Break it down: What does the system do?

What organs make it up?

The integumentary system regulates body temperature through the skin and sweat glands. It keeps you at a stable (or normal) temperature when you get hot.

Examples

How does your respiratory system maintain homeostasis? Break it down: What does the system do?

What organs make it up?

Your respiratory system exchanges gases. It maintains homeostasis by making sure your oxygen levels are stable.

Examples

How does your circulatory system maintain homeostasis? Break it down: What does the system do?

What organs make it up?

The circulatory system distributes nutrients to, and removes wastes from, cells. It also helps to carry oxygen and water to cells. This helps maintain homeostasis by keeping oxygen and water levels stable.

Remember the Catalyst?

Why do you get hungry? What body system can maintain

homeostasis and how does it do it?

Nervous system

Oxygen level? Temperature? Food intake? Amount of water?

Remember the Catalyst?

What happens when you get very cold? What body system(s) can maintain homeostasis

and how does it do it?

Integumentary system Musclar system Circulatory system

Oxygen level? Temperature? Food intake? Amount of water?

Remember the Catalyst?

Why do you use the restroom more when you drink a lot of water? What body system can maintain

homeostasis and how does it do it?

Excretory

Oxygen level? Temperature? Food intake? Amount of water?

Now you Try

Memory and Dominoes!!!

Key Point Wrap-Up

Key Point #1: Cells Organs Organ systems.

Key Point #2: Homeostasis is the process of maintaining a stable internal environment. STABLE! (normal, even, level, or

balanced) Oxygen levels, temperature, food intake, amount

of water Organ systems work together to maintain

homeostasis.

Exit Questions

1. Which of the following is the correct function of the excretory system?

A. To eliminate wastes

B. To control all the body’s function

C. To distribute nutrients

D. To support the body and protect organs

2. Which of the following is made by the endocrine system?

A. Energy

B. Urine

C. Hormones

D. Blood3. Describe what your

body systems have to do to maintain homeostasis. (Be sure to include what has to stay stable!)

Write in complete sentences!

Don’t talk during the Exit Question!