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20 Multiple choice questions on muscles and bones

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1. The basic unit of contraction is the
a. myosin
b. actin
c. Z-Lines
d. sarcomeres

2. A cord or strap of dense tissue that connects a muscle to bone is called a:
a. tendon
b. ligament
c. bursa
d. arthritis

3. The functional partners of bone is:
a. Tendon
b. Ligament
c. Skeletal muscle
d. Fasciae

4. What are dark bands that define the two ends of each sacromeres called.
a. myosin
b. actin
c. Z-Lines
d. sarcomeres

5. This is the explanation of how muscles contract.
a. Lock and Key Hypothesis
b. Cell Theory
c. Mendels laws
d. Sliding filament model

6. The "thick" muscle filament is composed of:
a. myosin
b. actin
c. Z-Lines
d. sarcomeres

7. After intense exercise, what helps repay the body's oxygen debt?
a. stretching
b. breathing
c. eating
d. thinking

8. A motor unit is made up of _________________
a. all the muscle fibers within a given muscle
b. a motor neuron and the muscle fibers it innervates
c. all the neurons going into an individual section of the body
d. a fascicle and a nerve

9. The structure that connects muscles to bones is the ______
a. aponeurosis
b. fascicle
c. tendon
d. ligament

10. The fiber cell membrane is termed the ______
a. myofibril
b. myosin
c. myofilament
d. sarcolemma

11. Which of the following does not belong with the others?
a. filament
b. myosin
c. myofibril
d. actin

12. The smallest, functional unit of contraction is the
a. fiber
b. sarcomere
c. filament
d. myofibril

13. What type of contraction is characterized by a rapid, jerky response to a single
stimulus?
a. summation
b. treppe
c. tonic
d. twitch

14. Which of the following is not performed by muscles?
a. motion
b. excretion
c. maintenance of posture
d. heat production

15. Muscle tissue refers to all contractile tissue. To what does the term muscular system
most often refer?
a. skeletal muscle system
b. cardiac muscle system
c. visceral muscle system
d. computerized muscle tissue

16. The all-or-none response means that
a. all of the muscles in a region contract together.
b. all of the muscle fibers within a muscle contract together.
c. when a muscle fiber contracts, it contracts completely.
d. when a muscle fiber contracts, all of its ATP is changed to ADP

17. What are the actin and myosin filaments in muscle composed of?
a. Nucleic acids
b. Fatty acids
c. Proteins
d. Carbohydrates

18. What triggers the release of calcium ions from the sarcoplasmic reticulum?
a. Formation of actin-myosin cross-bridges
b. Sarcomere contraction
c. An action potential
d. An increase in calcium ion concentration

19. A skeletal muscle is stimulated to contract when its plasma membrane is excited by a
message from a_____________ . This message is received at the neuromuscular
junction.
a. sensory neuron
b. motor unit
c. motor neuron
d. sarcoplasm

20. Approximately how many skeletal muscles are there in the human body?
a. 1,000
b. 600
c. 100
d. 60

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https://brainmass.com/biology/musculoskeletal-system/20-multiple-choice-questions-on-muscles-and-bones-44113

Solution Preview

1. The basic unit of contraction is the
a. myosin
b. actin
c. Z-Lines
d. sarcomeres

Answer: d. sarcomeres

2. A cord or strap of dense tissue that connects a muscle to bone is called a:
a. tendon
b. ligament
c. bursa
d. arthritis

Answer: a. tendon
Skeleton muscles are joined to bone by tough connective tissue called tendons.
Bursa - a fluid-filled sac in the knee and shoulder joints to cushion the bones.
Ligament - tough, flexible bands of connective tissue holding bone to bone at joints.
Tendon - tough, inflexible bands of connective tissue attaching muscle to bone

3. The functional partners of bone is:
a. Tendon
b. Ligament
c. Skeletal muscle
d. Fasciae

Answer: c. Skeletal muscle
The Skeleton and its joints support, protect, and provide flexibility for the body, but the Skeleton cannot move itself. That job is performed by the Muscle Tissue.
Tendon connects bone to muscle. Ligaments join bone to bone.

4. What are dark bands that define the two ends of each sacromeres called.
a. myosin
b. actin
c. Z-Lines
d. sarcomeres

Answer: c. Z-Lines
The Region From one Z-line to the next is called a sarcomere.

5. This is the explanation of how muscles contract.
a. Lock and Key Hypothesis
b. Cell Theory
c. Mendels laws
d. Sliding filament model

Answer: d. Sliding filament model

6. The "thick" muscle filament ...

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Nine multiple choice questions on mechanics (force, work, energy, power, moment, torque)

1. An offensive lineman weighs twice what you weigh, and has three times your arm strength. You are trying to push him out of the way. The magnitude of the force he exerts on you will be:
A. six times the force you exert on him.
B. three times the force you exert on him.
C. twice the force you exert on him.
D. the same as the force you exert on him.

2. When catching a ball:
A. the ball performs positive work on the glove and the glove performs negative
work on the ball.
B. the ball performs negative work on the glove, and the glove performs positive work on the ball.
C. positive work is performed on both the ball and the glove.
D. no work is performed on either the ball or the glove.

3. The kinetic energy of a baseball traveling at 80 mph, compared to the same ball traveling at 40 mph, is:
A. twice. B. four times. C. half. D. None of the above.

4. A pitcher exerts an average horizontal force of 60 N against a baseball while moving it through a horizontal displacement of 2.0 m before he releases it. The horizontal velocity the ball acquires is 40 m/s. If the pitcher were to exert only 30 N, how much horizontal displacement of the ball would be needed for it to acquire the same horizontal
velocity?
A. 1.0 m. B. 2.0 m. C. 4.0 m. D. 30 m.

5. Bill lifts a 1000 N barbell 1.5 m in 1 second, while Bob lifts a 1400 N barbell 2.0 m in 2 seconds. Whose average power output is greater?
A. Bill's B. Bob's. C. They are equal. D. Who cares.

6. The moment arm of a muscle is:
A. the distance from the joint to the point where the nearest tendon attaches to bone.
B. the distance from the joint to the point where the farthest tendon attaches to bone.
C. muscle length × tan(joint angle).
D. None of the above.

7. The weight of your forearm, hand, and an additional weight is 50 N, and this total weight, which tries to extend your elbow, has a moment arm of 20 cm about the elbow joint. The biceps is the only muscle in the elbow which is contracting, its force being 500 N. The moment arm of the biceps is 2 cm. What is the net torque about the elbow?
A. 500 N.m.
B. 10 N.m.
C. Zero.
D. Can not be determined from the information provided.

8. Three forces act on an object, whose resultant is not zero. If the net torque due to the three forces is zero, then:
A. equilibrium is possible.
B. the object will spin at an increasing rate.
C. the object will accelerate.
D. None of the above.

9. In equilibrium, muscle force is usually much larger in magnitude than the external force on a body segment. The net force on the segment is nevertheless zero because:
A. the net torque due to the external and muscle forces is zero.
B. there are contact forces at joints.
C. gravitational forces should not be included in equilibrium conditions.
D. muscle moment arms are small.

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