ZOO/V/06 Student's Copy
2 0 1 8
Pre-CBCS
5th Semester
ZOOLOGY
SIXTH PAPER
Animal Physiology
Full Marks 55
Time 2½ hours
PART A—OBJECTIVE
Marks 20
The figures in the margin indicate full marks for the questions
Answer all questions
SECTION—A
Marks 5
Tick the correct answer in the brackets provided 1×5=5
1. Most digestive enzymes are
hydrolases
transferases
mutases
oxidoreductases

2. Which of the following is called the pacemaker of the heart?
AV node
bundle of His
Purkinje fibre
SA node
3. Artificial kidney machine can cleanse the blood through the process of
osmosis
dialysis
plasmolysis
haemolysis
4. During skeletal muscle contraction, there is shortening of
actin filaments
A-band
myosin
sarcomere
5. A neuron generally has all the following principal areas, except
microvilli
a cell body
dendrites
an axon
SECTION—B
Marks 15
Write short notes on the following 3×5=15
1. Cutaneous respiration
2. Blood coagulation
3. Osmoregulation
4. Muscle fatigue
5. Resting potential

PART B—DESCRIPTIVE
Marks 35
The figures in the margin indicate full marks for the questions
1. What do you understand by intracellular digestion? Describe the
mechanism of protein digestion with suitable schematic representation.

OR
Define external respiration. Give an account of lung respiration.
2. Write notes on the following 3½+3½=7
Closed circulation
Pacemaker
OR
Describe the structure and functions of haemoglobin. 7
3. Describe the physiology of urine formation. 7
OR
Write notes on the different types of nitrogenous wastes. 7
4. Define striated muscles. Write an account on the muscle proteins. 7
OR
Describe the mechanism of muscle contraction. 7
5. What are neurons? Describe the propagation of nerve impulse along
non-myelinated nerve fibre.
OR
What are the major neurotransmitters? Discuss in detail the structure of
a synapse with suitable diagram.