Animal physiology - II CIA

In a non-myelinated neuron, where do action potentials primarily starts?

• a) Entire axon surface

• b) Nodes of Ranvier

• c) Axon hillock   

• d) Cell body

The unidirectional conduction of nerve impulses is ensured by _____________.

• a) Refractory period

• b) Myelin sheath        

• c) Axon diameter       

• d) Synapse

The neuromuscular junction primarily involves __________ neurotransmitter.

• A) Dopamine
  

• B) Serotonin
  

• C) Acetylcholine
  

• D) GABA

Resting membrane potential is maintained by the __________ pump.

• A) Calcium
  

• B) Sodium-Potassium
  

• C) Proton
  

• D) Chloride

The postsynaptic membrane has ________________ for neurotransmitters.

• A) Receptors
  

• B) Channels
  

• C) Enzymes
  

• D) Vesicles

Depolarization occurs when __________ ions enter the neuron.

• A) Sodium
  

• B) Potassium
  

• C) Calcium
  

• D) Chloride

Assertion: Myelinated axons conduct impulses faster than non-myelinated axons.
Reason: Saltatory conduction allows continuous conduction of impulses.

• a) Both Statement A and R are true.
  

• b) Both Statement A and R are false
  

• c) Statement A is true and Statement R is false.
  

• d) Statement A is false and Statement R is true.

Match and Choose the correct answer

Myelinated neurons                      -1) High sodium channel density

Synapse                             -2) Continuous conduction                

Non-myelinated neurons -3) Acetylcholine

Node of Ranvier               - 4) Neurotransmitter release

                                                            -5) Saltatory conduction

 

                       

           

 

• a)          1         2          3          4         

            

•   b)          5         4          1          3                     

             

• c)          4         3          1          2         

       

• d)         5          3          2          1

The P wave in an ECG represents:

• A) Atrial depolarization
  

• B) Ventricular depolarization
  

• C) Atrial repolarization
  

• D) Ventricular repolarization

Normal blood pressure for an adult is approximately:

• A) 120/80 mmHg
  

• B) 140/90 mmHg
  

• C) 100/60 mmHg
  

• D) 160/100 mmHg