Locomotion and Movement

Osteoporosis, an age-related disease of skeletal system, may occur due to

Lack of relaxation between successive stimuli in sustained muscle contraction is known as:

Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction.

Smooth muscles are

Out of 'X' pairs of ribs in humans only 'Y' pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation :

The pivot joint between atlas and axis is a type of

Calcium is important in skeletal muscle contraction because it

Select the correct option.

Which of the following muscular disorders is inherited?

Which of the following diseases is an autoimmune disorder?

Match the following joints with the bones involved: List I (a) Gliding joint (b) Hinge joint (c) Pivot joint (d) Saddle joint List II (i) Between carpal and metacarpal of thumb (ii) Between Atlas and Axis (iii) Between the carpals (iv) Between Humerus and Ulna Select the correct option from the following:

Match the following columns and select the correct option. Column I (a) Floating Ribs (b) Acromion (c) Scapula (d) Glenoid cavity Column II (i) Located between second & seventh ribs (ii) Head of the Humerus (iii) Clavicle (iv) Do not connect with the sternum

Match List I with List II. List I (a) Scapula (b) Cranium (c) Sternum (d) Vertebral column List II (i) Cartilaginous joints (ii) Flat bones (iii) Fibrous joints (iv) Triangular flat bone Choose the correct answer from the options given below:

Chronic auto immune disorder affecting neuromuscular junction leading to fatigue, weakening and paralysis of skeletal muscle is called as:

During the muscular contraction which of the following events occur? (a) 'H' zone disappears (b) 'A' band widens (c) 'I' band reduces in width (d) Myosine hydrolyzes ATP, releasing the ADP and Pi. (e) Z-lines attached to actins are pulled inwards. Choose the correct answer from the options given below.

Which of the following statements wrongly represents the nature of smooth muscle?

Given below are two statements: Statement I: Autoimmune disorder is a condition where the body defense mechanism recognizes its own cells as foreign bodies. Statement II: Rheumatoid arthritis is a condition where the body does not attack self cells. In the light of the above statements, choose the most appropriate answer from the options given below:

Which of the following is present between the adjacent bones of the vertebral column?

Which of the following is a correct match for disease and its symptoms?

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Osteoporosis is characterised by decreased bone mass and increased chances of fracture. Reason (R): Common cause of osteoporosis is increased levels of oestrogen. In the light of the above statements, choose the most appropriate answer from the options given below:

Match List-I with List-II. List-I: (A) Palm bones (B) Wrist bones (C) Ankle bones (D) Digit bones List-II: (I) Phalanges (II) Metacarpals (III) Carpals (IV) Tarsals Choose the correct answer from the options given below:

Match List I with List II: List I (Type of Joint) A. Cartilaginous Joint B. Ball and Socket Joint C. Fibrous Joint D. Saddle Joint List II (Found between) I. Between flat skull bones II. Between adjacent vertebrae in vertebral column III. Between carpal and metacarpal of thumb IV. Between Humerus and Pectoral Girdle Choose the correct answer from the options given below:

Which of the following statements are correct regarding skeletal muscle? A. Muscle bundles are held together by collagenous connective tissue layer called fascicle. B. Sarcoplasmic reticulum of muscle fibre is a store house of calcium ions. C. Striated appearance of skeletal muscle fibre is due to distribution pattern of actin and myosin proteins. D. M line is considered as functional unit of contraction called sarcomere. Choose the most appropriate answer from the options given below:

Match List I with List II: List I: A. Fibrous joints B. Cartilaginous joints C. Hinge D. Ball and socket joints List II: I. Adjacent vertebrae, limited movement II. Humerus and Pectoral girdle, rotational movement III. Skull, don't allow any movement IV. Knee, help in locomotion Choose the correct answer from the options given below:

Three types of muscle tissue are shown as (a), (b) and (c): (a) Long, parallel, cylindrical striated (cross-banded) fibres with peripheral nuclei. (b) Spindle-shaped (fusiform) non-striated cells tapering at both ends, each with a single central nucleus. (c) Striated, branched fibres joined end-to-end with central nuclei. Identify the correct matching pair along with their location in the human body (Name of muscle / location):

Which of the following represents the correct sequence of arrangement of bones in the lower limb of humans?

Match List I with List II related to muscular/skeletal system: List I A. Tetany B. Arthritis C. Myasthenia gravis D. Muscular dystrophy List II (I) Inflammation of joints (II) Autoimmune disorder affecting neuromuscular junction (III) Wild contraction in muscle due to low Ca$^{2+}$ in body fluid (IV) Progressive degeneration of skeletal muscle Choose the correct answer from the options given below:

Which of the following is the correct order of arrangement of the vertebral column from head to toe?

Sperm motility is due to ___________.

Which of the following statements are correct with reference to human endoskeleton? A. Human skull is monocondylic. B. The joint between any two adjoining vertebrae is a cartilaginous joint. C. In human beings, the number of cervical vertebrae is seven. D. All ribs except the last 2 pairs are bicephalic. E. The occipital bone of skull is articulated with atlas vertebra. Choose the correct answer from the options given below:

Choose the correct statements regarding muscle contraction. A. A motor neuron carries a signal sent by the Central Nervous System (CNS) to the sarcolemma of the muscle fibre. B. The neural signal generates an action potential which causes the release of Ca$^{2+}$ into sarcoplasm. C. Increase in Ca$^{2+}$ inactivates the actin for breaking cross bridges. D. Actin binds to the myosin head to form a cross bridge. E. Shortening of sarcomere takes place, by pulling actin filaments towards the centre of 'A' band. Choose the correct answer from the options given below :

The number of vertebrae in a human is ________.

Muscle contraction is initiated by a signal sent by the central nervous system by the release of _____.