The attachment of a muscle s tendon to the stationary bone is called the ; the attachment of the muscle s other tendon to the movable bone is called the

Correct Answer: C

Rationale: The origin is the muscle's tendon attachment to a stationary bone, while the insertion attaches to a movable bone, allowing movement when the muscle contracts. For instance, in the quadriceps, the origin is on the pelvis (stationary), and the insertion is on the tibia (movable), enabling knee extension. Origin, action and insertion, action misdefine the second term, as action is the movement, not an attachment. Insertion, origin reverses the correct order. Origin, insertion accurately reflects anatomical convention, making it the correct choice, as it defines the fixed and mobile ends critical to muscle function and motion.

Correct Answer: A

Rationale: Nodding yes uses a first-class lever: the atlanto-occipital joint (fulcrum) sits between the effort (neck muscles like splenius) and load (head weight), like a seesaw. Second-class levers (e.g., calf raise) have the load between fulcrum and effort, not here. Third-class levers (e.g., biceps curl) place effort between fulcrum and load, unlike nodding. First-class lever is the correct answer, as it matches the neck's pivot mechanics, essential for understanding head movement in biomechanics.

Correct Answer: C

Rationale: Skeletal muscle drives actions under conscious control, like typing or breathing (when deliberate), by contracting and pulling tendons attached to bones. This enables precise, intentional movements across the body. Involuntary processes like digestion depend on smooth muscle, which operates automatically in organ walls, while blood pumping is the cardiac muscle's domain in the heart. Suggesting skeletal muscle controls most involuntary movements misattributes its voluntary nature smooth and cardiac muscles handle those. 'None of the above' ignores its evident function. Skeletal muscle's voluntary role, tied to its striated structure and nervous system integration, sets it apart, supporting posture, locomotion, and deliberate actions, contrasting with the autonomic functions of other muscle types, making it indispensable for willed physical activity.

Correct Answer: C

Rationale: During anaerobic muscle contraction, like in intense exercise, glucose breaks down without oxygen, forming lactic acid. This accumulates when oxygen is scarce, causing the burn felt during sprints. Glucose is the starting fuel, not a product. Oxygen drives aerobic respiration, not produced here. Sugar is a vague term for glucose, not the output. Lactic acid's production marks anaerobic metabolism, distinguishing it from aerobic water and carbon dioxide outputs, explaining fatigue and tying to energy shifts in high-demand scenarios, unlike initial substrates or unrelated elements.

Correct Answer: A

Rationale: A ligament is a small, dense, white, fibrous band of elastic tissue connecting bones to stabilize joints, like the anterior cruciate ligament in the knee. Its collagen-rich structure provides strength and slight elasticity. A muscle junction (e.g., neuromuscular) involves nerve-muscle interaction, not fibrous tissue. Muscle filaments are actin/myosin within muscle cells, not bands. Muscle cartilage isn't a term cartilage is avascular, unlike fibrous tissue. Ligaments' role in joint support and their fibrous, elastic nature match the description perfectly, making them the correct choice, as they're distinct from muscle components or junctions in both structure and function.