FREE NEET Biology Practice MCQ Test: Locomotion And Movement Exercise 3 Questions Answers With Detailed Explanations [PDF]

Answer: (a)

Myosin is a fibrous protein which forms (together with actin) the contractile filaments of muscle cells and is also involved in motion in other types of cell. Myosin comprises a family of ATP-dependent motor proteins and is best known for their role in muscle contraction and their involvement in a wide range of other eukaryotic motility processes. They are responsible for actin-based motility. Therefore they acts as ATPase.

Answer: (c)

Answer: (b)

Answer: (d)

Answer: (a)

Arthritis or inflammation of a joint makes the joint painful and may even immobilise the movements at the joint. This may result from a lack of the synovial fluid at the joint. The ossification of the articular cartilage, deposition of uric acid crystals in the joint cavity or other changes at the joint.

Answer: (b)

Answer: (c)

Answer: (c)

Answer: (d)

Answer: (d)

Answer: (b)

Pivot joint is the joint found between the atlas and axis between the radius and ulna just below the elbow. This joint allows movement in only one plane. In a pivot joint, a rounded or pointed bone fits into a shallow depression of another bone.

Saddle joint provides free movement in two planes back-forth and side to side. The projection of one bone fits in a saddle-shaped depression of another bone. The joint between the carpel and the metacarpal of thumb in the hand is an example of saddle joint.

Hinge joint allows movement primarily in one plane. In a hinge joint a reel like surface of one bone fits into the concave surface of another bone for example elbow, knee, ankle, etc.

Gliding joint also known as plane joint, it is a common type of synovial joint formed between bones that meet at flat or nearly flat articulating surface. Examples of gliding joint include carpel bones of the wrist and joint between the carpel and metacarpal of the palm.

Answer: (c)

Answer: (d)

In human, 12 pairs of ribs are present out of which 7 pairs of ribs (1st to 7th pair) are dorsally attached to vertebral column and ventrally to the sternum.

Answer: (b)

The number of cervical vertebrae are same in man and whale that is 7 in number.

Answer: (b)

Repeated activation of the muscles can lead to the accumulation of lactic acid due to anaerobic breakdown of glycogen in them, causing fatigue.

Answer: (b)

Answer: (c)

Answer: (a)

Red muscle fibres are one of the two main types of skeletal muscle, which contains abundant mitochondria and myoglobin. Red muscle fibres contract and fatigue more slowly than white fibres and generate ATP by aerobic catabolism of glucose and fats, utilizing myoglobin-bound $O_{2}$ .

Sarcoplasmic reticulum is a system of membrane-bound tubules that surrounds muscle fibrils, releasing calcium ions during contraction and absorbing them during relaxation.

Answer: (c)

Upper rounded end of the humerus (bone of arm) is called head that articulates into the glenoid cavity of the pectoral girdle (shoulder girdle) of scapula or shoulder blade bone.

Answer: (d)