WGU C458 study questions and verified

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Unit 1: Physical Health

Unit 1—Module 1: Body Systems

• Define the key structures found in the skeletal system.

• The axial skeleton – protects the brain, heart, and lungs • Bones - provide the rigid skeleton that constitutes the internal framework the body needs to stand • Joints - (also referred to as an articulation) is where two bones come together • Cartilage - the tough but flexible tissue that covers the ends of the bones of freely movable joints and protects bones by preventing them from rubbing against each other • Ligament - a connective tissue that binds one bone to another • Tendons - a connective tissue that attaches muscle to bone

• Name the three types of muscle found in the body.

• Striated muscle – (also known as skeletal muscle) moves all bones and controls facial expressions and eye movements • Smooth muscle – (or visceral muscle) lines the walls of the internal organs, such as the intestines • Cardiac muscle – is a combination of striated and smooth muscle. Only the heart has cardiac muscle

• Define the two main divisions of the nervous system (uses electrical impulses to send msgs):
• Central nervous system

(CNS) Nerves inside the brain and spinal cord that send signals to other parts of the body

• Peripheral nervous system

(PNS) All Nerves outside of the brain and spinal cord

• Define the key structures and organs associated with the respiratory system.
• Lungs – primary organ
• Respiratory Passages
• Define the structures of the upper respiratory tract and the lower respiratory tract.
• Upper respiratory tract – nose, pharynx (throat), and Larynx (voice box)
• Lower respiratory tract – trachea (windpipe), bronchial tree, and lungs
• Describe the main structures of the cardiovascular system.
• Heart – circulates blood throughout the body
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