chemical digestion breaks down food by chemically crunching iit down and does cemical reaction

Red blood cells carry oxygen to the organs and take away CO2. They also give blood its red color. Red blood cells make up about 55% of blood.

Platelets help repair cuts and wounds by making a plug. A complete plug can be made in 3-5 minutes, but it doesn't last very long. Platelets are part of the around 1% that also contains white blood cells.

White blood cells help fight infection. They can detect when diseases enter the body, and when they detect them, they start going to it right away. White blood cells are part of the around 1% that also contains platelets.

Plasma is the liquid that holds all of the blood cells. Plasma is also very valuable, and you can sell yours to make money. Plasma makes up around 45% of blood.

Arteries take blood away from the heart.

Veins take blood to the heart.

Capillaries are the most important ones. Capillaries are thinner than veins and arteries and live in the villi in the small intestine. Because they are thinner, they allow for nutrients to diffuse into the bloodstream.

Ribcage protects lungs

Diaphragm, Intercostal, and Abdominal Wall Muscles help expand and contract the nasal cavity.

The nervous system regulate the breathing rate by using pH

pH scale is based on hydrogen ion concentration, acidic is lower, alkaline is higher.

The increase of CO2 causes the increase the hydrogen ion concentration

Chemical energy is energy stored in the bonds of molecules. Examples are gasoline, batteries, and food.

Mechanical energy is energy from objects moving within a system. Examples include a pen (a clicking mechanism) and gears.

Nuclear energy is energy achieved through atomic reactions. Examples include nuclear fission and nuclear power plants.

Gravitational energy is energy due to gravitational forces. Examples include apples falling from trees and falling after jumping.

Light and radiant energy are energy from electromagnetic waves that produce light and radiation. Examples include the sun and lightbulbs.

Sound energy is energy from sound waves. These vibrations traveling through the air contain energy. Examples include output from a speaker or someone talking.

Kinetic energy (motion energy) is energy that objects possess through movement. Examples include rolling a bowling ball or spinning a top.

Thermal energy (heat energy) is energy from the movements of molecules inside a substance. As we learned in 6th grade, molecules move faster when there is more heat. These movements produce energy, the hotter the more. Examples include fire and the sun (heat, not light).

These types of energy are forms of obtaining electrical energy.

Solar panels work by taking the light, radiant, and thermal energy from the sun and converting it into electrical energy. (For a more complicated explanation, look up the photovoltaic effect.)

Wind turbines work by getting energy from spinning with the wind. The spinning powers a generator to produce electric energy.

Hydroelectric dams work similarly to wind turbines, the only difference is that hydroelectric dams use flowing water to power the generator instead of wind.

Biomass involves taking natural resources such as wood and burning them to get thermal energy to convert into electrical energy. This is also known as fossil fuels.

Geothermal methods involve drilling into the earth and using the heat in the crust for thermal energy that we convert into electrical energy.

ATP energy is the result of the chemical reaction known as cellular respiration, where oxygen and glucose go into a cell and it makes water, carbon dioxide, and ATP energy. This process is the way most cells get energy, in the form of ATP.

Stored energy is similar to potential energy, just that this type isn't always actively about to be used, but stored until needed. Humans have stored energy after we sleep and eat.