Human Body Systems

Organization of the Body • List the levels of organization in a

multicellular organism, from smallest to largest. – Cells – Tissues – Organs– Organ systems

Organization of the Body• What are four types of tissues found

in the human body

• The four types of tissues are• muscle tissue,•epithelial tissue, •connective tissue, •nervous tissue

Organization of the Body• The eye is an example of a (an) ____.

•organ

Organization of the Body What type of tissue covers interior

and exterior body surfaces?

• epithelial

Organization of the Body

What is a gland?

• A gland is a structure that makes and secretes a particular product such as saliva, sweat, or milk.

Organization of the Body• What type of tissue connects body

parts?

• connective

Maintaining Homeostasis • What is the process of maintaining a

controlled, stable internal environment called?

• homeostasis

Maintaining Homeostasis

Maintaining Homeostasis• Is the following sentence true or

false? • The part of the brain that monitors

and controls body temperature is the hypothalamus.

• true

Human Body Team

All the systems play a part. How do they interact?

Which one is the most important?

Integumentary SystemSkin, Hair and Nails• covers and protects

every place on the body• is the first line of defense

against invasion and injury

• retains body heat yet, have pores to release excess heat and wastes

• retains moisture and your body is almost 80% water

Skeletal System• Without this, you’d

have no shape or structure

• ability to move!• makes your red blood

cells that carry oxygen to all the cells

• protects the precious brain, heart and spinal cord

Muscular System• The heart is made

of cardiac muscle.• The internal organs

are made of smooth muscle.

• Without the skeletal muscles the bones couldn’t move.

Respiratory System• brings in the oxygen that is carried on the

red blood cells• carries the CO2 (waste gas) out of the body. • The circulatory system needs this for gas

exchange.• The muscles need oxygen to move.• The brain needs

oxygen to think.

Circulatory System

• Carries oxygen and nutrients to every cell in the body

• Consists of the heart, the veins, the arteries, capillaries and blood

• transports the white blood cells to all the infections and injuries

• Without this, the oxygen and the CO2 in the body couldn’t reach the cells or lungs.

Nervous SystemI tell everything what to do. I tell the heart when to beat, the body when to move, the digestive system to add enzymes.

I am the leader.

Digestive/Excretory System

• Without this system, the body would not be able to obtain energy and nutrients.

• It breaks down all the food you eat into usable nutrients and expels the wastes.

Reproduction System

• Without this, there wouldn’t be any systems.

• I am how the species continues.

Nervous system Coordinates the body’s response to changes in its

internal and external environments

Skeletal system   Stores mineral reserves and provides a site for

blood cell formationIntegumentary

system   Serves as a barrier against infection and injury Endocrine system    Eliminates wastes and maintains homeostasis Lymphatic/Immune

systems Helps protect body from disease.

Muscular system Helps produce voluntary movement, circulate

blood, and move food Reproductive

system Produces reproductive cells

Respiratory system Provides oxygen and removes carbon dioxide Excretory system Eliminates wastes and maintains homeostasis

Circulatory system Brings materials to cells, fights infection, and helps

to regulate body temperature Digestive system Converts food so it can be used by cells