MBtP 9-11 Concept 4 Unit 3

Term Definition
Anatomy The study of a body's structure
Cells Basic units of all life
DNA A long molecule found in a cell's nucleus that contains the instructions for making and operating a cell.
Pathogen A tiny, disease-carrying organism
T Lymphocytes Protector cells that destroy cells that have been invaded by viruses
B Lymphocytes Protector cells that respond to pathogens and release antibodies to disable pathogens
Tendon Tissue that connects muscle to bone
Voluntary Muscle Muscles that function when you consciously decide to move them
Involuntary Muscle Muscles that function or contract without you thinking about it
Ligaments Elastic bands that connect two bones
Cardiac Muscle Involuntary heart muscle
Smooth Muscle Involuntary muscle found inside hollow organs
Skeletal Muscle Voluntary muscle that pulls on the bones of the skeleton to make them move
Plane Joints Joints with bones that slide over on another, such as in wrists and ankles
Hinge Joints Joints that allow bending and straightening of the knees, fingers, and elbows
Ball and Socket Joints Joints that involve one bone fitting into another bone
Pivot Joints Joints that involve one bone swiveling around the other
Nerve Impulses High-speed electrical signals that travel along neurons to send messages to the brain
Reflex An automatic, split-second response to our environment that occurs when a message travels to the spinal cord and straight back to our body so we react accordingly

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