Joints
This type of joint is immovable and found between the bones of the skull.
What is a fibrous joint?
This term refers to where two or more bones meet.
What is an articulation?
This muscle type is voluntary and striated, and it attaches to bones for movement.
What is skeletal muscle?
The primary function of skeletal muscles is to produce this kind of body movement.
What is voluntary movement?
This part of the nervous system includes the brain and spinal cord.
What is the central nervous system (CNS)?
This type of synovial joint allows movement in two planes, like your fingers bending and straightening.
What is a hinge joint?
This fluid-filled structure reduces friction between articulating bones in freely movable joints.
What is the synovial cavity (or synovial fluid)?
This molecule is the direct source of energy for muscle contraction.
What is ATP?
Besides movement, skeletal muscles also help maintain this essential body position, even when you're not moving.
What is posture?
These specialized cells transmit electrical signals throughout the nervous system.
What are neurons?
Found in the shoulder and hip, this type of joint allows for the greatest range of motion.
What is a ball-and-socket joint?
The articulation between the radius and ulna that allows the forearm to rotate is this type of joint.
What is a pivot joint?
During muscle contraction, these two proteins slide past each other to shorten the sarcomere.
What are actin and myosin?
This term refers to the main muscle responsible for a specific movement, like the biceps during elbow flexion.
What is the agonist (or prime mover)?
This division of the peripheral nervous system controls involuntary actions like heart rate and digestion.
What is the autonomic nervous system?
These joints are slightly movable and are connected by cartilage, such as the joints between the vertebrae.
What are cartilaginous joints?
This classification describes joints based on the degree of movement they allow, such as synarthroses, amphiarthroses, and diarthroses.
What is functional classification of joints?
This ion, released from the sarcoplasmic reticulum, binds to troponin and initiates contraction.
What is calcium (Ca²⁺)?
These muscles oppose the action of a prime mover and help control movement.
What are antagonists?
This is the rapid change in membrane potential that travels along a neuron’s axon.
What is an action potential?
This type of synovial joint allows rotation around a single axis and is found where the first and second cervical vertebrae meet.
What is a pivot joint?
This specific type of cartilage covers the surfaces of bones at synovial joints and helps absorb shock.
What is hyaline cartilage?
This is the name for the repeating unit of a muscle fiber, made of actin and myosin filaments, that shortens during contraction.
What is a sarcomere?
These muscles assist the prime mover by adding force or reducing unnecessary movement.
What are synergists?
This neurotransmitter is released at neuromuscular junctions to stimulate skeletal muscle contraction.
What is acetylcholine?