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Skeletal System
$200This hard tissue makes up the bulk of the adult human skeleton.
$400This fibrous tissue connects bone to bone at a joint.
$600The humerus is located in this part of the body.
$800This mineral is essential for maintaining strong skeletal structure.
$1000The skull is composed of these two primary types of cranial and facial groups.
Circulatory System
$200This muscular organ pumps blood throughout the entire body.
$400These vessels carry oxygenated blood away from the heart.
$600This component of blood is responsible for clotting.
$800This fluid transports nutrients and oxygen to cells.
$1000This node is known as the natural pacemaker of the heart.
Digestive System
$200This long muscular tube connects the throat to the stomach.
$400This organ produces bile to help break down fats.
$600Most nutrient absorption occurs in this part of the small intestine.
$800This pouch-like organ stores bile between meals.
$1000This gland secretes insulin to regulate blood sugar.
Nervous System
$200This main control center is protected by the skull.
$400These cells are the fundamental units that transmit electrical signals.
$600This structure acts as the primary relay between the brain and the body.
$800This space exists between two communicating nerve cells.
$1000This region of the brain coordinates balance and motor control.
Respiratory System
$200These primary organs facilitate the exchange of gases.
$400This dome-shaped muscle separates the chest cavity from the abdomen.
$600These tiny air sacs are where oxygen enters the bloodstream.
$800This structure is commonly referred to as the windpipe.
$1000This flap of tissue prevents food from entering the airway during swallowing.
Muscular System
$200This type of muscle is found in the walls of the heart.
$400These tissues attach muscle to bone.
$600This protein filament works with myosin to cause contraction.
$800This large back muscle is responsible for arm adduction.
$1000This type of muscle movement is controlled consciously by the brain.