Big Idea. The human body is made up of systems that have different functions, an these systems work together to maintain the body.

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1 Big Idea The human body is made up of systems that have different functions, an these systems work together to maintain the body.

2 Body Organization CELLS TISSUES ORGANS Organ Systems

4 Unit 1 Lesson 1 Introduction to Body Systems How do the body systems work together to maintain homeostasis? Key Terms: homeostasis (will be combined with lesson 2) Copyright Houghton Mifflin Harcourt Publishing Company

5 Unit 1 Lesson 1 Introduction to Body Systems P6-8 Inside Out What do the body systems do? Body systems (organ systems) help organisms coordinate and complete the necessary functions for life.

6 Unit 1 Lesson 1 Introduction to Body Systems P6-8 What do the body systems do? The muscular system allows movement of body parts. The skeletal system supports the body, protects important organs, and makes blood cells. The respiratory system gathers oxygen from the environment and gets rid of carbon dioxide. The male reproductive system produces sperm and delivers it to the female reproductive system. The female reproductive system produces eggs and nourishes a developing fetus. he cardiovascular system moves blood through the body.

7 Unit 1 Lesson 1 Introduction to Body Systems P6-8 What do the body systems do? The lymphatic system returns leaked fluids back to the blood and is a part of the immune system. The endocrine system makes chemical messages that regulate conditions in the body. The integumentary system is the protective covering of the body that acts as a barrier. The excretory system gets rid of the body s waste. The digestive system breaks down food into nutrients that can be used by the body. The nervous system collects information and responds to it by sending messages.

8 - Body Organization and P6-8Homeostasis Organs and Organ Systems Each organ in your body is part of an organ system, which is a group of organs that work together to perform a major function.

9 Working Together Activity Which organ system(s) is involved in these activities? P6-8 Activity Snoring 3 Organ Systems Involved in activity Sweating 3 Jumping at a loud sound 6 Drinking Water 5 Running 5 Eating an apple Maintaining a heartbeat 5 3

10 Working Together Activity Which organ system(s) is involved in these activities? Activity Organ Systems Snoring (3) Sweating (3) Jumping at a loud sound (6) Drinking Water (5) Running (5) Eating an apple (5) Maintaining a heartbeat (3)

11 Unit 1 Lesson 1 Introduction to Body Systems A Closer Look How are structure and function linked? Different organisms can have organs with similar structures, functions, shapes, and sizes. The shapes and sizes of cells are related to their function. P8 7) The movement ability of muscle cells allows muscle tissue to contract and relax, which moves the body.

12 Unit 1 Lesson 1 Introduction to Body Systems A Closer Look How do body systems work together? Body systems must work together to keep the body working properly. Many organs are part of several body systems. Cells communicate by electrical and chemical messages. P9

P9 8) Underline the following: The endocrine system releases hormones to prepare the body for action. The eyes, part of the nervous system, see the ball coming.

13 P9 8) Underline the following: The endocrine system releases hormones to prepare the body for action. The eyes, part of the nervous system, see the ball coming. They send electrical messages to the brain. The brain sends electrical messages to the muscles. The bones and muscles grip the bat tightly. The muscles and bones help the legs move quickly. The heart pumps quickly to move blood from the lungs to the body. Muscles use oxygen from the blood to keep moving. 9) The nervous system and the integumentary system are interacting. The integumentary system is producing the sweat, which causes water to be lost from the body. The brain, which is part of the nervous system, detects that the body needs more water and is making the person thirsty.

14 Unit 1 Lesson 1 Introduction to Body Systems Keeping the Balance What is homeostasis? P10 Basic Needs of ALL cells: Food, oxygen and have their wastes takes away. If body conditions were to change cells would not be able to do their jobs. Homeostasis is the body maintaining a constant internal environment when outside conditions change. Body systems can respond (quickly and in the right way) to changes in the external environment. Copyright Houghton Mifflin Harcourt Publishing Company

15 Unit 1 Lesson 1 Introduction to Body Systems Keeping the Balance What is homeostasis? P10 10) The body temperature increases, the person feels hot, and he or she sweats Copyright Houghton Mifflin Harcourt Publishing Company

16 Unit 1 Lesson 1 Introduction to Body Systems P11 What can go wrong with homeostasis? A problem in one body system may cause problems in other body systems. Body cells cannot work properly may cause disease or death. Lack of food and the presence of toxins (prevent cells from carrying out life processes) or pathogens (break down cells)may disrupt the proper functioning of body systems. Problems with the structure or function of cells, tissues, or organs can cause problems in the body. If cells cannot get energy or necessities, they cannot work properly. disrupt homeostasis When the body cannot maintain homeostasis, it is easier for pathogens to invade the body.

The brain cannot respond properly to internal or external messages Liver and other organs can be harmed by alcohol,

17 Body System Affected What are the effects? P11 Nervous System Digestive System Reproductive System Disrupts proper functioning of the brain. The brain cannot respond properly to internal or external messages Liver and other organs can be harmed by alcohol, which will affect the ability of the system to digest food and remove toxins from the body. Could harm the ability to produce healthy sex cells, or in the case of a woman, develop and nourish a healthy baby.

18 P12 13) Respiratory 14) Nervous, Blood 15) Nervous; Muscular (either order) 16) Brain or nervous system 17) The amount of oxygen getting into the body will be reduced, so every cell and every system would be starved of oxygen. The body s tissues and organs would not be able to work properly pg 13 & WS due Monday

19 #1 Test Corrections ALL students will do test corrections. Write evidence of why the answer is correct. (pg #, explanation, logical reasoning) #2 Missing Work/Grade report You will receive a grade report Do the most current missing work first. If you need ANYTHING raise your hand and wait for me to come to you personally.

Introduction to Body Systems

Lesson 1 Introduction to Body Systems ESSENTIAL QUESTION How do the body systems interact to maintain homeostasis? By the end of this lesson, you should be able to describe the functions of the human body