Tag: our skeletal system and the skin

Questions Related to our skeletal system and the skin

A deltoid ridge occurs in

biology skeleton, joints and muscles skeleton our skeletal system and the skin skeleton - movement and locomotion

  1. Radius

  2. Ulna

  3. Femur

  4. Humerus

Show answer
Correct Option: D
Explanation:
  • The forelimb comprises of humerus, radius, ulna, carpals, metacarpals, and phalanges.
  • The humerus is the long bone in the upper arm. It is located between the shoulder and the elbow joint.
  • The roughly triangular area on the anterolateral (front-side) surface of the middle of the humerus is called as the deltoid ridge. The deltoid muscle is attached to the deltoid ridge. Hence a deltoid ridge occurs in the humerus.
  • So, the correct answer is 'Humerus'.

Number of bones present in an arm is

biology skeleton, joints and muscles skeleton our skeletal system and the skin skeleton - movement and locomotion

  1. 30

  2. 32

  3. 35

  4. 40

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Correct Option: A
Explanation:
  • Each arm is made of 30 bones. The bones of the hand (forelimb) are humerus, radius and ulna, carpals (wrist bones – 8 in number), metacarpals (palm bones – 5 in number) and phalanges (digits – 14 in number).
  • Hence the number of bones present in an arm is '30'.
  • So, the correct answer is '30'.

Greater trochanter occurs in

biology skeleton, joints and muscles skeleton our skeletal system and the skin skeleton - movement and locomotion

  1. Humerus

  2. Radius

  3. Ulna

  4. Femur

Show answer
Correct Option: D
Explanation:
  • Lower limb comprises of 32 bones. They are hip bone (1), femur (1), patella (1), tibia (1), fibula (1), tarsals (8), metatarsals (5), proximal phalanges (5), intermediate phalanges(5) and distal phalanges (4).
  • Greater trochanter of the femur is quadrilateral elevation, projecting upward from the lateral aspect of the junction of neck and shaft. Hence greater trochanter occurs in the femur.
  • So, the correct answer is 'Femur'.

Sigmoid notch of olecranon process is found in

biology skeleton, joints and muscles skeleton our skeletal system and the skin skeleton - movement and locomotion

  1. Tibius-fibula

  2. Femur

  3. Radius-ulna

  4. Humerus

Show answer
Correct Option: C
Explanation:
  • The forelimb is composed of the humerus, radius and ulna, carpals (wrist bones – 8 in number), metacarpals (palm bones – 5 in number) and phalanges (digits – 14 in number). Hence radius-ulna is bones of the forelimb.
  • The olecranon process is the near end of the ulna and it forms the pointed portion of the elbow.
  • Sigmoid notch is a large depression in the upper extremity of the ulna that fits the trochlea of the humerus (the bone directly above the ulna in the arm) as part of the elbow joint. It is formed by the olecranon and the coronoid process.
  • Hence sigmoid notch of the olecranon process is found in radius-ulna.
  • So, the correct answer is 'Radius-ulna'.

Trochanters occur in

biology skeleton, joints and muscles skeleton our skeletal system and the skin skeleton - movement and locomotion

  1. Humerus

  2. Femur

  3. Radio-ulna

  4. Tibio-fibula

Show answer
Correct Option: B
Explanation:

Trochanter is the bony prominences present toward the near end of the thighbone or femur. The trochanters are the points at which hip and thigh muscles attach. These trochanters usually serves as muscle attachment sites. So, the correct answer is 'Femur'. 

We move our hands while walking for

biology skeleton, joints and muscles skeleton our skeletal system and the skin skeleton - movement and locomotion

  1. Faster movement

  2. Balancing

  3. Increasing blood circulation

  4. Relieving tension

Show answer
Correct Option: B
Explanation:
  • We move our hands while walking is a natural motion wherein each arm swings with the motion opposite that of the leg.
  • Moving arms in an opposing direction with respect to the lower limb reduces the angular momentum of the body which helps in balancing the rotational motion produced during walking.
  • Hence we move our hands while walking for balancing.
  • So, the correct answer is 'Balancing'.

Biceps is attached with

biology skeleton, joints and muscles skeleton our skeletal system and the skin skeleton - movement and locomotion

  1. Radius

  2. Ulna

  3. Femur

  4. Both A and B

Show answer
Correct Option: D
Explanation:
The biceps is a muscle on the front part of the upper arm. The biceps includes a “short head” and a “long head” that work as a single muscle.
The biceps is attached to the arm bones by tough connective tissues called tendons. The tendons that connect the biceps muscle to the shoulder joint in two places are called the proximal biceps tendons. The tendon that attaches the biceps muscle to the forearm bones (radius and ulna) is called the distal biceps tendon. When the biceps contracts, it pulls the forearm up and rotates it outward.
So the correct answer is 'Radius and Ulna'.

Epiphyseal discs, which are present at the ends of long
bones are responsible for

biology skeleton, joints and muscles skeleton our skeletal system and the skin skeleton - movement and locomotion

  1. Bone elongation

  2. Growth of thickness of the bone

  3. Kemoaemng me shape at bone

  4. Formation of Haversian canal

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Correct Option: A
Explanation:

Epiphyseal plate (hyaline cartilage) is formed between diaphysis and epiphysis. This contributes in bone elongation.

Olecranon process occurs in

biology skeleton, joints and muscles skeleton our skeletal system and the skin skeleton - movement and locomotion

  1. Femur

  2. Radius

  3. Humerus

  4. Ulna

Show answer
Correct Option: D
Explanation:
  • The bones of the hand (forelimb) are humerus, radius and ulna, carpals (wrist bones – 8 in number), metacarpals (palm bones – 5 in number) and phalanges (digits – 14 in number).
  • The olecranon is the near end of the ulna which forms the pointed portion of the elbow.
  • Hence ulceranon process occurs in ulna.
  • So, the correct answer is 'Ulna'.

Glenoid cavity is associated with

biology skeleton, joints and muscles skeleton our skeletal system and the skin skeleton - movement and locomotion

  1. Scapula

  2. Humerus

  3. Femur

  4. Both A and B

Show answer
Correct Option: D
Explanation:
  • A pectoral girdle or shoulder girdle attach the bones of upper limb to the axial skeleton.
  • Each pectoral girdle is formed of two halves. Each half of pectoral girdle consists of a scapula and clavicle. 
  • Glenoid cavity is a shallow, pyriform articular surface, which is located on the lateral angle of the scapula. It articulates with the humerus to form the shoulder joint. Hence glenoid cavity is associated with scapula and humerus.
  • So,the correct answer is 'Both A and B'.