Human Biology

The study of the human body

Bellringer• What is the basic unit of structure and

function in a living thing? • Organize the following from smallest to

largest: $1, 50¢, $5,000, and 1¢• Why do the cells in the following pictures look

different?

Specialized Cells Perform Specific Jobs!• Red blood cells: Bring oxygen, carbon dioxide

and nutrients around the body• Nerve cells: Send messages around the body• Digestive cells: absorb nutrients from food• Lung cells: Get oxygen in and carbon dioxide

out• Bone cells: supports body and protects organs• Reproductive cells: produce offspring• Muscle cells: move the body

Tissue

• Cells combine to form tissue. Tissue is a group of similar cells that perform the same job.

• There are 4 kinds of tissue:– Epithelial Tissue– Connective Tissue– Nerve Tissue– Muscle Tissue

Muscle Tissue• Helps your body move• 2 Types of Muscle: Involuntary and Voluntary• Involuntary muscles are not under your own

control-Example: digestive muscles

• Voluntary muscle are under your own control-Example: biceps and triceps

• Skeletal muscles help move bones and work in pairs

Nervous and Epithelial Tissues

• Nervous tissue carries messages back and forth from the brain and the body

• Epithelial tissue covers your body and protects tissue underneath it– Example: Skin

Organs

• Organs are all of the different parts of our body composed of different kinds of tissue!

• Organs work together to accomplish jobs and create body systems

Organ Systems

• Organ systems are groups of organs that do certain jobs in our body

Digestive System!