Locomotion and Movement
Test 9

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which structural component of skeletal muscle is responsible for its striated appearance?

Sarcolemma
Myofibrils
T-tubules
Sarcomere
4

The sarcomere, composed of actin and myosin filaments, is responsible for the striated appearance of skeletal muscles.

Which type of cartilage is found in the intervertebral discs?

Hyaline cartilage
Elastic cartilage
Fibrocartilage
Calcified cartilage
3

Fibrocartilage provides strength and flexibility, making it ideal for intervertebral discs.

Which bone in the human body is responsible for the formation of the elbow joint along with the humerus?

Radius
Ulna
Scapula
Clavicle
2

The ulna, along with the humerus, forms the elbow joint.

Which of the following regions of a sarcomere shortens during muscle contraction?

A-band
I-band
Z-line
M-line
2

The I-band shortens as actin filaments slide over myosin during contraction.

Which type of joint is found between the carpal bones of the wrist?

Hinge joint
Ball and socket joint
Gliding joint
Pivot joint
3

Gliding joints, found in the wrist, allow bones to slide over one another with limited movement.

Which of the following statements about the sarcomere is correct?

Sarcomere is the functional unit of contraction in muscle fibers.
The H-zone increases during contraction.
The I-band remains the same length during contraction.
The A-band shortens during contraction.
1

Sarcomere is the structural and functional unit of contraction in striated muscle fibers​.

Which of the following muscles is involuntary?

Skeletal muscle
Biceps
Cardiac muscle
Triceps
3

Cardiac muscles are involuntary in function, while skeletal muscles are voluntary​.

Which type of joint is present between the atlas and axis vertebrae?

Hinge joint
Pivot joint
Saddle joint
Gliding joint
2

The joint between the atlas and axis vertebrae is a pivot joint, allowing rotational movement​..

Which of the following bones belongs to the appendicular skeleton?

Sternum
Scapula
Vertebra
Ribs
2

The scapula is part of the appendicular skeleton, while the sternum, vertebrae, and ribs are part of the axial skeleton​.

Which hormone plays a key role in increasing calcium levels in the blood by acting on bones?

Calcitonin
Thyroxine
Parathyroid hormone
Insulin
3

Parathyroid hormone increases calcium levels by promoting bone resorption.

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