Skeletal System
What is the longest and strongest bone in the human body, located in the upper leg?
Femur
What type of muscle tissue is attached to bones and controlled voluntarily to enable movement?
Skeletal Muscle
What are the specialized nerve cells that send and receive electrical impulses throughout the body called?
Neurons
Which major blood vessels carry oxygenated blood away from the heart to the rest of the body?
Arteries
Where does gas exchange take place?
Alveoli
How do bones and skeletal muscles work together as a lever system to produce limb movement during physical exercise?
Skeletal muscles contract and pull on tendons, which attach to bones.
According to the sliding filament theory, how do actin and myosin filaments interact during a muscle contraction?
Myosin heads bind to actin filaments, forming cross bridges, and pull the actin inward toward the center of the sarcomere.
How do the central nervous system and muscular system coordinate to increase motor unit recruitment during an intense task?
The brain and spinal cord send higher-frequency action potentials down motor neurons, signaling more motor units to contract to generate more force.
Why do veins have one-way valves inside them, but arteries do not?
Arteries don't need valves because high pressure from the heart keeps blood moving in one direction.
How does the movement of your diaphragm muscle pull air into your lungs when you take a deep breath?
When your diaphragm contracts, it moves downward, expanding the chest cavity and brings in air.