Locomotion and Movement — Page 9 | NEET Biology

Q81

Glenoid cavity articulates:

A Scapula with acromion

B Clavicle with scapula

C Humerus with scapula

D Clavicle with acromion

Correct Answer

Option C

Solution

(c) Glenoid cavity of scapula articulates with the head of humerus to form the shoulder joint.

Q82

Out of 12 pairs of ribs in humans only 7 pairs are true ribs. Select the option that correctly represents values:

A X=12, Y=5 - True ribs attached dorsally to vertebral column and sternum.

B X=24, Y=7 - True ribs dorsally attached to vertebral column but free on ventral side.

C X=24, Y=12 - True ribs dorsally attached to vertebral column but free on ventral side.

D X=12, Y=7 - True ribs attached dorsally to vertebral column and ventrally to the sternum.

Correct Answer

Option D

Solution

(d) 12 pairs of ribs; 7 pairs (true ribs) attached dorsally to vertebral column and ventrally to sternum.

Q83

The pivot joint between atlas and axis is a type of:

A Cartilaginous joint

B Synovial joint

C Saddle joint

D Fibrous joint

Correct Answer

Option B

Solution

(b) Pivot joint between atlas and axis is a type of synovial joint allowing rotational movement.

Q84

Select the correct option:

A 8th, 9th and 10th pairs of ribs articulate directly with the sternum.

B 11th and 12th pairs of ribs are connected to the sternum with the help of hyaline cartilage.

C Each rib is a flat thin bone and all the ribs are connected dorsally to the thoracic vertebrae and ventrally to the sternum.

D There are seven pairs of vertebrosternal, three pairs of vertebrochondral and two pairs of vertebral ribs.

Correct Answer

Option D

Solution

(d) 7 pairs vertebrosternal (true ribs), 3 pairs vertebrochondral (false ribs), 2 pairs floating (vertebral) ribs.

Q85

What is sarcomere?

A Part between two H-lines

B Part between two A-lines

C Part between two I-bands

D Part between two Z-lines

Correct Answer

Option D

Solution

(d) Sarcomere is the basic contractile unit — the region between two consecutive Z-lines.

Q86

Which ion is essential for muscle contraction?

A Na

B K

C Ca

D Cl

Correct Answer

Option C

Solution

(c) Ca2+ released from sarcoplasmic reticulum controls actomyosin complex formation for contraction.

Q87

Low Ca2+ in the body fluid may be the cause of:

A tetany

B anaemia

C angina pectoris

D gout

Correct Answer

Option A

Solution

(a) Tetany is caused by reduction in blood calcium level due to underactive parathyroid.

Q88

Select the correct statement regarding the specific disorder of muscular or skeletal system:

A Muscular dystrophy - age-related shortening of muscles.

B Osteoporosis - decrease in bone mass and higher chance of fractures with advancing age.

C Myasthenia gravis - Auto immune disorder which inhibits sliding of myosin filaments

D Gout - inflammation of joints due to extra deposition of calcium.

Correct Answer

Option B

Solution

(b) Osteoporosis: decrease in bone mass with advancing age, causing fractures.

Q89

Select the correct statement with respect to disorders of muscles in humans

A Rapid contractions of skeletal muscles causes muscle dystrophy

B Failure of neuromuscular transmission in myasthenia gravis can prevent normal swallowing

C Accumulation of urea and creatine in the joints cause their inflammation

D An overdose of vitamin D causes osteoporosis

Correct Answer

Option B

Solution

(b) Myasthenia gravis damages neuromuscular junction, causing muscle fatigue and difficulty swallowing.

Q90

Which of the following hormones can play a significant role in osteoporosis?

A Aldosterone and Prolactin

B Progesterone and Aldosterone

C Parathyroid hormone and Prolactin

D Estrogen and Parathyroid hormone

Correct Answer

Option D

Solution

(d) Estrogen promotes osteoblast activity; parathormone causes bone demineralization. Both role in osteoporosis.