The symptoms of dizziness and vomiting, faced by a person travelling at higher altitude is because of the following resaons
(i) The function of Eustachian tube is to equalise the pressure on either sides of the ear drum; sudden elevation in height causes disturbance in maintaining pressure by this area of ear.
(ii) The semicircular ducts, the anterior, posterior and lateral semicircular ducts, are enlarged at one end to give rise to ampulla. Each ampulla contains sensory path of hairs, the cristae, which is concerned with the balancing of the body, Change in altitude brings changes in the reorientation and adjustments in these structures of internal ear causing the above said symptoms.
Complete the statement by choosing appropriate match among the following.
| Column I | Column II | ||
|---|---|---|---|
| A. | Resting potential | 1. | Chemicals involved in the transmission of impulses at synapses. |
| B. | Nerve impulse | 2. | Gap between the pre synaptic and post synaptic neurons. |
| C. | Synaptic cleft | 3. | Electrical potential difference across the resting neural membrane. |
| D. | Neurotransmitters | 4. | An electrical wave like response of a neuron to a stimulation. |
A. $\rightarrow(3)$ B. $\rightarrow$ (4) C. $\rightarrow$ (2) D. $\rightarrow$ (1)
| Column I | Column II | ||
|---|---|---|---|
| A. | Resting potential | 1. | Electrical potential difference across the resting neural membrane. |
| B. | Nerve impulse | 2. | An electrical wave like response of a neuron to a stimulation. |
| C. | Synaptic cleft | 3. | Gap between the pre-synaptic and pos-synaptic neurons. |
| D. | Neurotransmitters | 4. | Chemicals involved in the transmission of impulses at synapses. |
The major parts of the human neural system is depicted below. Fill in the empty boxes with appropriate words.
The major parts of the human neural system is filled in the boxes with appropriate words
Differences between electrical transmission and chemical transmission are as given below
| Electrical Transmission | Chemical Transmission |
|---|---|
| It occurs at electric synapse. | It occurs at chemical synapse. |
| Synaptic cleft may or may not be present. | synaptic cleft is present. |
| At electrical synapses, electrical current can flow directly from one neuron into the other across these synapses. | At chemical synapse, neurotransmitter from pre-synaptic neurons transfer to post-synaptic neurons leading to transmission of impulse. |
| Impulse transmission across an electrical transmission is always faster. | Chemical transmission is slower. |