Immediately after an action potential has peaked, which cellular gates open?
1. Sodium
2. Chloride
3. Calcium
4. Potassium
The stapes sends its vibrations to
1. Incus
2. Round window
3. Tympanic membrane
4. Oval window
Pneumotaxic centre which can moderate the functions of the respiratory rhythm centre is present at:
1. Pons region of brain
2. Thalamus
3. Spinal cord
4. Right cerebral hemisphere
In a chemical synapse, when an impulse arrives at the axon terminal, it:
1. leads to opening of the calcium channels at the post synaptic membrane
2. Stimulates the movement of synpatic vesicles towards the membrane
3. causes the binding of the neurotransmitter of its receptors on the post synaptic neuron
4. activates the opening the potassium channels in the axon terminal
Consider the following statements:
I. A motor neuron along with the muscle fibers connected to it constitute a motor unit
II. The neurotransmitter released at the neuro-muscular junction is Acetylcholine.
III. Myosin head has ATPase activity
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II, and III
Consider the following statements:
I. Somatic neural system relays impulses from CNS to skeletal muscles.
II. Autonomic neural system transmits impulses from CNS to involuntary organs and smooth muscles
III. Unmyelinated nerve fibres are commonly found in spinal and cranial nerves
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I,II and III
What is coordination?
1. It is the process through which two or more organs interact and complement the functions of one another
2. It is the process of serving tissues
3. It is the process of giving blood and masses to other tissue at the level of structure
4. It is the ratio of functional and non functional organs
Which of the following would not occur when we do physical exercises?
(1) Increased energy demand
(2) Increased oxygen supply and increased urine formation
(3) Increased in the rate of respiration, heart beat
(4) Increased blood flow via blood vessels
In our body, which of the following systems do not jointly coordinate and integrate all the activities of the organs so that they function in a synchronised fashion?
(1) Neural system
(2) Endocrine system
(3) Circulatory system
(4) Both B and C
Neuron cannot perform which of the following functions?
(1) Detection of stimuli
(2) Receiving stimuli
(3) Transmitting different kinds of stimuli
(4) Giving nutrition to neuroglial cells