ATI RN
Muscular System Test Questions and Answers Questions
Question 1 of 5
What is the function of the vertebral column?
Correct Answer: D
Rationale: The vertebral column protects the spinal cord (not heart, a), supports the head , and allows movement/flexibility via joints e.g., cervical flexion. Heart protection is rib cage/sternum. All functions apply, per spinal anatomy, making 'd' correct.
Question 2 of 5
What type of joint allows for the most movement?
Correct Answer: C
Rationale: Synovial joints (e.g., shoulder) allow the most movement flexion, rotation via fluid-filled capsules. Fibrous are immovable (sutures), cartilaginous slightly movable (vertebrae). Synovial's range, per joint types, makes 'c' correct.
Question 3 of 5
Humans have the most urgent need for a continuous supply of
Correct Answer: C
Rationale: Humans need oxygen most urgently, surviving only minutes without it, as it fuels cellular respiration (ATP production) via lungs. Food sustains days, water hours to days, nitrogen isn't directly needed (it's in air, not a pressing requirement). Oxygen's immediate necessity, per survival physiology, makes 'c' correct.
Question 4 of 5
In 1901, Wilhelm Röntgen was the first person to win the Nobel Prize for physics. For what discovery did he win?
Correct Answer: D
Rationale: Röntgen won the 1901 Nobel for discovering X-rays, electromagnetic waves revealing internal structures (e.g., bones), revolutionizing medicine. Nuclear physics was later, radiopharmaceuticals involve isotopes, radiation-cancer link wasn't his focus. X-rays' impact, per history, makes 'd' correct.
Question 5 of 5
When athletes warm up, they illustrate a(n) type of muscle contraction.
Correct Answer: C
Rationale: Warming up, athletes perform movements like stretching or light jogging, exemplifying treppe the staircase effect. Initial contractions increase force progressively as calcium accumulates and muscle fibers activate more efficiently, enhancing performance without fatigue. Isotonic contractions shorten muscles against constant load (e.g., lifting), while isometric maintain length under tension (e.g., planks) both common in exercise but not warm-up specific. Twitch is a single, brief contraction, not sustained activity. Tetanus involves maximal, fused contractions from rapid stimuli, typical of intense effort, not warm-ups. Treppe, observed in physiology labs, boosts contractility over successive stimuli at low frequency, warming muscle tissue, increasing blood flow, and optimizing enzyme activity. This priming contrasts with isotonic's dynamic shortening or tetanus's sustained force, aligning with warm-ups' preparatory role. Studies show treppe elevates twitch force 20-50% early on, a subtle yet critical enhancement for athletes, distinct from static or exhaustive contraction types.