Locomotion and Movement
Test 5

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which type of muscle fiber is responsible for quick, powerful contractions but fatigues quickly?

Red muscle fibers
White muscle fibers
Smooth muscle fibers
Cardiac muscle fibers
2

White muscle fibers have fewer mitochondria, contract quickly, and fatigue faster than red muscle fibers.

Which of the following structures is responsible for connecting the femur to the pelvic girdle?

Glenoid cavity
Acetabulum
Humerus
Clavicle
2

The acetabulum of the pelvic girdle forms the socket for the head of the femur in the hip joint.

Which structure stores oxygen in muscle cells?

Myosin
Actin
Myoglobin
Hemoglobin
3

Myoglobin is an oxygen-binding protein found in muscle cells that provides oxygen for aerobic respiration.

What is the function of tropomyosin in muscle contraction?

Activates myosin ATPase
Binds calcium ions
Regulates actin-myosin binding
Stores ATP
3

Tropomyosin regulates muscle contraction by blocking myosin-binding sites on actin filaments.

Which of the following statements about muscle contraction is incorrect?

Myosin heads contain ATPase activity.
Calcium ions play a key role in muscle contraction.
ATP is not required for muscle contraction.
Actin filaments slide over myosin filaments during contraction.
3

ATP is essential for muscle contraction as it provides energy for the movement of myosin heads​.

Which of the following is a correct statement about skeletal muscles?

They are involuntary in nature.
They have striations and are voluntary.
They are found in the walls of visceral organs.
They are non-striated.
2

Skeletal muscles are striated and under voluntary control​.

Which of the following bones belongs to the axial skeleton?

Femur
Humerus
Sternum
Scapula
3

The sternum is part of the axial skeleton, whereas the femur, humerus, and scapula belong to the appendicular skeleton​..

Which statement about muscle fatigue is correct?

It is caused by an accumulation of lactic acid.
It occurs due to a deficiency of glucose in the blood.
It is caused by excessive ATP availability.
It is due to excessive calcium ion release.
1

Muscle fatigue occurs due to the accumulation of lactic acid during anaerobic respiration​.

Which joint allows movement in all directions?

Hinge joint
Pivot joint
Ball and socket joint
Gliding joint
3

Ball and socket joints, such as the hip and shoulder joints, allow movement in multiple directions.

Which structure serves as the functional unit of contraction in a muscle fiber?

Sarcolemma
Myofibril
Sarcomere
Sarcoplasmic reticulum
3

The sarcomere is the basic contractile unit of a muscle fiber, consisting of actin and myosin filaments.

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