Levels of Organization

Name 10

• Name five, three letter body parts above the neck.

• Name five, three letter body parts below the neck.

Answers

• Above: Lip, Gum, Ear, Eye, Jaw

• Below: Arm, Leg, Hip, Toe, Rib

Name The Systems of the Body

• Name the organs of those systems

Key Concepts

• How is the human body organized?• What are the different types of tissues?• What are the functions of organ systems?

Key Terms

• Tissue• Organ• Organ system• Homeostasis

Cells, Tissues, and Organs❖ The body has five levels of organization:

Cells (Basic level)↓

Tissues↓

Organs↓

Organ Systems↓

Organism (Highest Level)

Cells & Tissues

• Cells are the basic units of life and make up all living things. In complex organisms, cells are specialized to perform specific functions.

• A tissue is a group of similar cells that work together to perform a specific function.

Tissues

• The human body has four main tissue groups:

1. Epithelial tissue- Functions as a protective boundary (skin)

2. Nerve tissue- Functions as a messaging system (brain and spinal cord)

3. Muscle tissue- Functions in movement4. Connective tissue- Functions to hold

parts together and insulate (bone, cartilage)

Organs and Organ Systems

• An organ is a structure that is made up of two or more types of tissue that work together to do a job.

• An organ system is a group of organs that work together to help the body meet its needs.

Stomach

• Epithelial: lines the stomach• Nervous: signals acid production, tells

brain when you’re hungry or full• Muscle: Physically breaks down food• Connective: supplies blood and nutrients

to stomach

Organ Systems

• The body’s organ systems work together to allow the human organism to grow, reproduce and maintain life. The organ systems include:–

– Integumentary– Skeletal system– Lymphatic system– Endocrine system– Muscular system– Respiratory system

– Digestive system– Urinary system – Circulatory system– Nervous system – Reproductive

system

Homeostasis

• Homeostasis is the ability of the body to maintain internal conditions.– For example, on a hot day you sweat to keep

the inside temperature constant even though the outside temperature changes. Avoid overheating from dehydration

– On a cold day you shiver to avoid hypothermia

Recap

• A group of cells are called?• A group of tissues are called?• A group of organs are called?• Homeostasis is…?

https://docs.google.com/file/d/1s3lRd8aZLYFCz4jcD0I0XcDYujN5I25M/preview