A motor unit is best described as:

  • All the nerve fibres and muscle fibres in a single muscle bundle

  • One muscle fibre and its single nerve fibre

  • A single motor neuron and all the muscle fibres that it innervates

  • It is the neuron which carries the message from muscle to CNS

Electrical excitation in a muscle fibre most directly causes:

  • Movement of tropomyosin

  • Attachment of the cross bridges to actin

  • Release of Ca+2 from sarcoplasmic reticulum

  • Splitting of ATP

The energy for muscle contraction is most directly obtained from:

  • Phosphocreatine                          

  • ATP

  • Anaerobic respiration                   

  • Aerobic respiration

Put the following phrases in proper order to describe what occurs at the neuromuscular junction to trigger muscle contraction:
I. Receptor sites on sarcolemma.
II. Nerve impulse.
III. Release of Ca+2 from sarcoplasmic reticulum
IV. The neurotransmitter acetylcholine is released
V. Sarcomere shortern
VI. Synaptic cleft
VII. Spread of impulses over sarcolemma on T-tubules

  • II, IV, I, VI, VII, III, V           

  • II, IV, VI, I, VII, III, V

  • I, II, III, IV, V, VI, VII             

  • VII, VI, V, IV, III, II, I

Go through the following diagram describing muscle contraction:

Now identify A to E:

  • A - Cross bridge, B - Cross bridge formation, C - Breaking of cross bridge, D - Sliding (rotation), E - ATP

  • A - Cross bridge, B - Cross bridge formation, C - Sliding / rotation, D - Breaking of cross bridge, E - ATP

  • A - Cross bridge, B - Breaking of Cross bridge, C - sliding / rotation, D - Cross bridge formation, E - AMP

  • A - Cross bridge, B - Cross bridge formation, C - Sliding / rotation, D - ADP, E - Breaking of cross bridge

The muscle band that remains unchanged during muscle contraction and relaxation of the skeletal muscle is:

  • I                     

  • A                    

  • H                    

  • Z-line

The compound or pigment acting as an oxygen store in skeletal muscles is:

  • Myoglobin                                    

  • Haemoglobin

  • Myokinase or ATP                         

  • Cytochrome

I. Number of mitochondria less.
II. Number of mitochondria more
III. Sarcoplasmic reticulum is abundant
IV. Myoglobin content high
V. Sarcoplasmic reticulum moderate
VI. Aerobic muscles
VII. Depend on anaerobic respiration for energy
VIII. Less myoglobin content
A. Red muscles B. White muscles
Identify above (I to VIII) traits as characteristic of A and B types of muscles:

  • A - I, III, VII, VIII; B - II, IV, V, VI

  • A - II, IV, V, VI; B - I, III, VII, VIII

  • A - I, III, IV, VII; B - II, V, VI, VIII

  • A - II, V, VI, VIII; B - I, III, IV, VII

How many bones make up the human skeleton?

  • 948                

  • 96                            

  • 796                

  • 206

Number of bones in human axial skeleton is:

  • 80                            

  • 106                

  • 206                

  • None of these

Skeletal muscles is made up of

  • Many muscle bundles

  • Fascicles

  • Both A and B are correct

  • Only microfilaments

Match Column-I with Column-II:
          Column-I                                              Column-II (Number of bones)
   A. Cranium / Brainbox                                            I. 22
   B. Skull (Cranial and facial bones)                           II. 8
   C. Face                                                                 III. 14
   D. Hind limb                                                          IV. 12 pairs
   E. Ribs                                                                  V. 30

  • A - I, B - II, C - III, D - V, E - IV             

  • A - II, B - I, C - III, D - V, E - IV

  • A - I, B - II, C - III, D - IV, E - V             

  • A - V, B - IV, C - III, D - II, A - I

Human skull is:

  • Dicondylic       

  • Monocondylic  

  • Procoelous      

  • Hetercoelous

Which of the following statements about human vertebral column is false:

  • Vertebral column consists of 26 vertebrae

  • It is ventrally placed

  • It extends from the base of skull and constitutes the main framework of the trunk

  • Neural canal in vertebra is the passage for spinal cord

Human adult vertebral formula is:

  • C4 T8 L4 S8 C8                               

  • C7 T8 L5 S6 C7

  • C7 T112 L2 S1 C2                            

  • C7 T12 L5 S1 C1

Typical ribs are:

  • Monocephalic                               

  • Dicephalic       

  • Tricephalic                                   

  • Tetracephalic

Match the Column-I with Column-II:
    Column-I                                         Column-II
A. True ribs                                          I. 3 pairs
B. False ribs                                         II. 2 pairs
C. Floating ribs                                     III. 7 pairs

  • A - I, B - II, C - III                     

  • A - III, B - I, C - II

  • A - III, B - II, C - I                     

  • A - II, B - I, C - III

The figure is of rib cage. Identify A, B and C respectively:

  • Coccyx, ribs, vertebral column     

  • Sternum, ribs, vertebral column

  • Scapula, ribs, vertebral column     

  • Tarsal, ribs, vertebral column

Number of the bones in human appendicular skeleton is:

  • 80                                             

  • 120                

  • 126                                             

  • 206

Number of bone in each upper limb is:

  • 1, 1, 1                                         

  • 8, 5, 14

  • 2, 2, 2, 16, 10, 28                       

  • 1, 1, 1, 8, 5, 14

An acromion process is characteristically found in:

  • Pelvic girdle of mammals             

  • Pectoral girdle of mammals

  • Skull bone                                   

  • Vertebrae of mammals

The shoulder blade is large triangular bone situated in the dorsal part of the thorax between the 2nd and the 7th ribs. It is called:

  • Clavicle           

  • Ilium               

  • Scapula           

  • Carplas

For articulation of head of humerus a depression found in scapula is called:

  • Acetabulum                                 

  • Manubrium

  • Occipital condyle                          

  • Glenoid cavity

Which one of the following is the longest bone in human?

  • Radius                                         

  • Tibia

  • Femur (Thigh bone)                     

  • Clavicle (Collar bone)

  • 4

Acetabulum occurs in:

  • Cranium                                               

  • Pectoral girdle                       

  • Pelvic girdle                                         

  • Vertebrae

Pelvic girdle (hip girdle) is composed _________ coxal (hip) bones:

  • 3                    

  • 2                    

  • 4                    

  • 5

Each coxal bone is formed by the fusion of 3 bones name .as:

  • () Ileum, ischium and pubis             

  • Ilium, ischium and puis

  • () Ilium, ischium and clavicle           

  • () Coracoid, ischium and pubis

Joint between bones in the form of sutures of human skull is:

  • Hinge joint                                  

  • Synovial joint

  • Cartilaginous joint                       

  • Fibrous joint

Gout is the inflammation of joints due to accumulation of:

  • Urea crystal                                 

  • NH3

  • Uric acid crystal                             

  • CaCO3 crystals

Tetany is the rapid spasm in muscles due to:

  • High Ca+2 in body fluid                

  • Low Ca+2 in body fluid

  • High uric acid in body fluid           

  • High urea in blood

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Practice Zoology Quiz Questions and Answers