Circulatory + Respiratory
These organs bring oxygen into the body.
The lungs.
This system controls muscle movement.
The nervous system.
This system breaks down food into nutrients.
The digestive system.
These two systems work together to allow movement.
These two systems work together to allow movement.
This system uses hormones to send messages.
The endocrine system.
This organ pumps oxygenated blood to the body.
The heart
These muscles are voluntary and attached to bones.
Skeletal muscles.
This system transports nutrients to the body.
The circulatory system.
This connects muscle to bone.
A tendon.
These organs filter blood and remove waste.
The kidneys.
This process happens in the lungs where oxygen enters the blood.
Gas exchange.
These signals travel from the brain to muscles to cause movement.
Nerve impulses.
This organ absorbs most nutrients into the bloodstream.
The small intestine.
This connects bone to bone.
A ligament.
This hormone controls blood sugar.
Insulin
These tiny sacs in the lungs exchange gases with capillaries.
Alveoli
This type of muscle is found only in the heart and works involuntarily.
Cardiac muscle.
This liquid part of blood carries nutrients.
Plasma.
This is where blood cells are produced inside bones.
Bone marrow.
This system removes waste from the body.
The excretory system.
Explain how oxygen travels from the lungs to body cells.
Oxygen enters the alveoli, diffuses into the blood, is carried by red blood cells, pumped by the heart, and delivered to body cells.
Describe how the brain causes a muscle to move.
The brain sends a signal through the spinal cord to a motor neuron, which causes the muscle to contract.
Explain how food becomes energy for cells.
Food is digested, nutrients are absorbed, enter the bloodstream, are transported to cells, and used for energy.
Explain how muscles move bones.
Muscles contract, pull on tendons, and move bones at the joints.
Explain how these systems help maintain homeostasis.
Hormones regulate body processes while the kidneys remove waste and balance fluids.