Muscular System Quiz
Questions: 16 · 10 minutes
1. In a typical limb movement, which attachment usually moves toward the more stable attachment when a muscle contracts?
The fascia
The origin
The insertion
The ligament
2. What happens to the diaphragm during a normal inhalation?
It relaxes and rises, reducing chest volume
It contracts and rises, reducing chest volume
It relaxes and flattens, increasing chest volume
It contracts and flattens, increasing chest volume
3. A condition interferes with the neurotransmitter normally released by motor neurons at the neuromuscular junction. Which neurotransmitter is directly involved?
Dopamine
Serotonin
Acetylcholine
Epinephrine
4. A rapid stretch triggers a reflex contraction that helps resist excessive lengthening. Which receptor primarily detects the change in muscle length?
Golgi tendon organ
Intervertebral disc
Neuromuscular junction
Muscle spindle
5. What is the basic repeating contractile unit within a skeletal muscle fiber?
Sarcomere
Fascicle
Tendon
Motor neuron
6. Which type of muscle tissue is primarily responsible for voluntary movement of the skeleton?
Smooth muscle
Cardiac muscle
Skeletal muscle
Epithelial tissue
7. During elbow flexion produced mainly by the biceps, which muscle generally acts as the antagonist?
Triceps brachii
Deltoid
Pectoralis major
Rectus abdominis
8. During cross-bridge cycling, what does ATP binding directly allow the myosin head to do?
Bind calcium inside the sarcoplasmic reticulum
Detach from actin
Release acetylcholine from the muscle fiber
Expose the binding sites on troponin
9. In skeletal muscle contraction, calcium exposes binding sites on actin by binding to which protein?
Myosin
Troponin
Collagen
Keratin
10. What makes up a motor unit?
One motor neuron and all the muscle fibers it controls
All the muscles that move a single joint
One muscle fiber and every neuron connected to it
One tendon and the muscle attached to it
11. Food is pushed through the digestive tract by involuntary contractions. Which muscle type produces this movement?
Skeletal muscle
Cardiac muscle
Smooth muscle
Voluntary striated muscle
12. Which description best matches cardiac muscle tissue?
Nonstriated, voluntary, and attached to bones
Striated, involuntary, and composed of branching cells
Nonstriated, involuntary, and found in hollow organs
Striated, voluntary, and made of long unbranched fibers
13. When you lift a cup by bending your elbow, what type of contraction occurs in the biceps as it shortens?
Passive stretching
Eccentric contraction
Isometric contraction
Concentric contraction
14. You hold a heavy grocery bag still with your elbow bent. Your muscles produce tension, but the joint angle does not change. What type of contraction is occurring?
Eccentric
Ballistic
Concentric
Isometric
15. A runner strains the structure that connects a calf muscle to a bone. Which structure was most likely injured?
A ligament
A tendon
A bursa
A joint capsule
16. While walking down stairs, the quadriceps lengthen under tension to control knee bending. What type of contraction is this?
Eccentric
Isometric
Concentric
Reflexive only