Objectives

• Identify the major tissues found in the body

• Compare an organ with an organ system

• Describe a major function of each organ system.

How does a person stay alive even though the environment around him or her is so cold?

• The answer:– Your body did not allow its internal

conditions to change enough to stop the cells from working properly.

– The maintenance of a stable internal environment is called homeostasis

– Homeostasis is not an easy task.

– Your body must perform many different “jobs” to maintain homeostasis

– Cells are organized into different “teams” to perform these jobs.

– Each cell in your body has a specific job in maintaining homeostasis.

• A group of similar cells working together forms a tissue.

• Your body contains four main types of tissue

•Epithelial tissue•Connective tissue•Muscle tissue•Nervous tissue

• Covers and protects underlying issue.

• When you look at the surface of your skin, you see epithelial tissue.

• The cells stick tightly and form a continuous sheet.

• Sends electrical signals through the body

• It is found in the brain, nerves, and sense organs

• Is made of cells that can contract and relax to produce movement.

• Joins, supports, protects, insulates, nourishes, and cushions organs.

• It also keeps organs from falling apart

• Two or more tissues working together from an organ.

• One type of tissue alone cannot do all the things that several types working together can do.

The stomach is an organ• The four types of tissue work together so that the

stomach can carry out digestion

– Nervous tissue in the stomach partly controls the production of acids that aid in the digestion of food. Nervous tissue signals when the stomach is full.

– Epithelial tissue lines the stomach.

– Layers of muscle tissue break up stomach contents

– Blood and a connective tissue called collagen are found in the wall of the stomach.

Organs Form Organs Form SystemsSystems

• Your stomach does much to help you digest your food, but it doesn’t do it all.

• It works together with other organs, such as the small intestine and large intestine, to digest your food.

• Integumentary system– Skin, hair, and nails protect underlying tissue

• Muscular system– Skeletal muscles move your bones

• Skeletal system– Bones provide a frame to support and protect

body parts

• Cardiovascular system– Heart pumps blood through all your blood vessels

• Respiratory system– Lungs absorb oxygen and release carbon

dioxide

• Urinary system– Removes wastes from the blood and

regulates the body’s fluids

• Reproductive system (male)– Produces and delivers sperm

• Reproductive system (female)– Produces eggs and nourishes and shelters

the unborn baby

• Nervous system– Receives and sends electrical messages throughout

the body

• Lymphatic system– Returns leaked fluids to blood vessels. It also

helps you get rid of germs that can ham you

• Digestive system– Breaks down the food you eat into nutrients that

can be absorbed into your body.

• Endocrine system– Glands regulate body functions by sending out

chemical messengers. The ovaries, in females, and testes, in males, are part of this system

• Make a chart that lists the major organ systems and their functions.