Organ Systems

CELLS

• Most basic form of life
• Can group together to make tissue
• Singled-felled organisms exist independent of other cells
• Multicellular organisms: multiple cells dependent on one another

TISSUES

• DON'T USE THESE FOR YOUR NOSE
• Three kinds of tissue: Connective,
• Made of multiple cells that work together
• Only in multicellular organisms

Organs

• Not that spooky instrument
• Made of tissues; not the nose kind
• Serve a purpose in the body
• Tend to be soft and squishy

Organ Systems

• Made of multiple organs
• All the systems work together to make the body not terrible.
• All serve a purpose

Musculoskeletal System

• Three types of muscles: Smooth, Cardiac, and Skeletal
• Smooth; involuntary, found in organs
• Skeletal: voluntary, why we talk so much
• Cardiac: only found in heart, involuntary, super important

Musculoskeletal System

• System composed of muscles and skeletal bones
• Muscles make bones move
• Bones supply new red blood cells to the body
• Bones support our weight

The musculoskeletal system and the integumentary system work together by the skin protecting the bone, and muscles, and the bones providing support and the muscles providing movement.

Integumentary System

• Largest organ of the body: skin
• Three layers: Epidermis, Dermis, Hypodermis
• Helps regulate body temperature and keep bodily fluids in.
• Fights infections and protects the internal organs from harm.

The integumentary system and the respiratory system work together quite well, as the skin and hair helps regulate body temperature, do the blood doesn't get too hot, and the circulatory system supplies blood to the skin, so it can regulate our internal temperature.

Circulatory System

• Includes just the heart
• Technically includes the whole body
• The most IMPORTANT SYSTEM
• Can't do much without it. Like living.
• Consists of the heart, lungs, and miles of veins and arteries.

The respiratory and circulatory system work together as the lungs supplies oxygen to the bloodstream, and our bodies need that 95% oxygen, 5% nitrogen mixture to survive.

Respiratory System

• Mainly lungs
• Lungs have tiny air sacs called alveoli
• The system supplies oxygen to the blood
• Blood then transports said oxygen to the rest of the body
• Super important to the body

The respiratory and the digestive system work together to supply necessary nutrients to the body, via oxygen and foods we eat.

The Digestive System

• Consists of the esophagus, the stomach, and your intestines...
• Esophagus carries food down to the stomach
• The stomach digests food with a special acid that can dissolve just about everything, even metal.
• Nutrients from inside the food are put to use, and the rest travels on.
• Intestines continue sucking nutrients out until it's nothing but waste.