a hard tissue made up mostly of cells, collagen and calcium
What is a bone?
100
tissue made of long cells that contract.
What is muscle?
100
a simple machine made of anything rigid that pivots around a fixed point
What is a lever?
100
the organ of the circulatory system that pumps blood.
What is the heart?
100
the amount of force per unit area
What is pressure?
200
a strong and flexible tissue that reduces friciton and increases flexibility
What is cartilage?
200
muscle filaments move closer to one another
What is a contraction?
200
the fixed point that a lever pivots around
What is a fulcrum?
200
the two upper chambers of the heart that recieve blood
What are atria?
200
this occurs if the coronary arteries cannot supply enough blood to the heart. The heart muscle may die and the heart may stop working if the muscle does not recieve enough oxygen.
What is a heart attack?
300
These joints allow bones to move back and forth. Examples include fingers, elbows, knees
What are hinge joints?
300
muslce filaments move away form each other
What is a muscle relaxation?
300
in this class of lever, the effort force and the resistance force are on opposite sides of the fulcrum
What is a first class lever?
300
the two lower chambers of the heart that pump blood out of the heart
What are ventricles?
300
this can occur if a blood vessel to the brain breaks or is blocked. Brain tissue can die if not enough oxygen can get to the brain tissue.
What is a stroke?
400
This type of joint allows bones to rotate.
Example- neck
What is a pivot joint?
400
this tissue connects bones to muscles and does not stretch as much as ligaments
What is a tendon?
400
in this class of lever the resistance force is between the fulcrum and the effort force.
What is a second class lever?
400
vessels that carry blood away from the ehart to organs in the body.
What are arteries?
400
a dangerous rise in blood pressure caused by blockages in or the hardening of blood vessels.
What is hypertension?
500
These joints allow bones to move and rotate in nearly all directions.
Examples- hips and shoulders
What are ball and socket joints?
500
the bending of a limb that decreases the angle between the bones of the limb.
What is a flexion?
500
a shovel is an example of this class of lever.
What is a third class lever?
500
blood vessels that deliver oxygen and nutrients to the organs and take up carbon dioxides and other wastes.
What are capillaries?
500
occurs when blood pressure is too low due to severe bleeding, injury, or allergic reaction.