Unit 3 Lesson 3 How Do Cells Work Together? Copyright Houghton Mifflin Harcourt Publishing Company
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2 How Cells Are Organized Cells are organized to work together so the body functions smoothly.
3 How do cells work together? Classwork 1: Question 1
4 How do cells work together? Classwork 1: Question 2 Organ system tissue organ
5 Tissue: is made up of cells of the same type that work together to do a certain job. The body has four different types of tissues: 1-Muscle tissue: responsible for movement. 2-Connective tissue: connects muscles to bone. 3- Nerve tissue: makes up your brain and spine. 4- Epithelial tissue: the outer layer of skin.
6 How do cells work together? Classwork 1: Question 3
7 Organ: An organ is made up of several tissues that work together to do a certain job. Organ system: Organs that work together to do a job for the body make up an organ system.
8 Let s think together What s the first thing that would happen if you touch a very hot cup?
9 The Information Highway Sensing your surroundings and communicating information are the jobs of your nervous system.
10 The Information Highway The nervous system is made of : 1-Nerve cells: - Chains of long nerve cells make up nerves. - Nerves carry information to and from the brain. (Deliver messages) 2- Brain: - processes information. 3- Spinal cord : - A rope-like bundle of nerve tissue. - The main pathway for information travelling to and from the brain.
11 The Information Highway Classwork 1: Question 4 Word bank Nerves Brain Spinal cord Eyes Brain
12 Classwork 2: Question 1
13 Classwork 2: Question 2
14 What are the five senses? Senses are your body s way of gathering information. Senses include sight, smell, hearing, taste, and touch.
15 Sight: - The eye is the sense organ that let you see. - The eye is sensitive(detects) light. 1- Iris: It is the part of the eye that gives your eye color. 2- Pupil: It s an opening in the iris. Light enters the eye through the pupil. 3-Retina: It s at the back of the eye. It contains nerve cells that detect light. These nerve cells send signals to the brain.
16 Classwork 2: Question 3 Word bank Light Retina Pupil Iris lens
17 Smell: Inside the nose, tiny structures sense (detect) chemicals in the air. These structures are attached to nerve cells in the olfactory bulb. The olfactory bulb transmits smell information from the nose to the brain
18 Classwork 2: Question 4 Word bank Brain chemicals olfactory bulb
19 Taste: Taste buds on the tongue sense (detect) chemicals in food. Taste buds are attached to nerves that send messages to the brain. The brain interprets this information as taste.
20 Classwork 2: Question 5 Word bank Taste buds chemicals
21 Classwork 2: Question 6
22 Hearing: How do we hear sounds? 1- The outer ear funnels sound into the middle ear causing the eardrum to vibrate.
23 Hearing: 2-Sound vibrations are passed to tiny bones called the (hammer, anvil, and stirrup). 3- These bones pass vibrations to the inner ear where a fluid-filled structure called the cochlea passes vibrations to tiny hairs on the nerves. 4- These nerves send messages about vibrations to the brain and you hear. - Ears are sensitive to (detect ) vibrations. Outer ear Ear drum Bones cochlea tiny hair nerves Brain
24 Classwork 3: Question 1 Word bank Eardrum Cochlea
25 Classwork 3: Question 2 Complete: Ear is sensitive to while the eye is sensitive to. Touch - Light vibration - chemicals
26 The Skin You re In Skin is a protective layer that covers the body. Skin, fingernails, toenails, and hair are part of the integumentary (covering)system. The integumentary system protects the inside of the body.
27 Why is the skin important? Skin keeps germs out of the body and water in the body. When you get too hot, sweat on the skin cools the body. When you get too cold, hair keeps your head warm. Hair also protects your skin.
28 The Skin You re In
29 The Skin You re In Identify the epidermis, dermis, nerve endings, and hair follicles in the image below.
30 The Skin You re In The epidermis is your outer layer of skin. The dermis is the inner layer of skin. It contains hair follicles, sweat glands, blood vessels, and nerve endings. Nerve endings are special structures that sense touch, heat, cold, pain, pressure, and vibration.
31 Classwork 3: Question 3
32 Classwork 3: Question 4
33
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