I: | The nose contains mucus-coated receptors which are specialised for receiving the sense of smell are called olfactory receptors. |
II: | Wall of the eyeball has three layers. The external layer is called choroid (dense connective tissue), middle layer is sclera (thin pigmented layer) and internal layer is retina (ganglion cells, bipolar cells and photoreceptor cells) |
List I | List II | ||
A. | Fovea | I | Visible coloured portion of eye that regulates diameter of pupil. |
B. | Iris | II. | External layer of eye formed of dense connective tissue. |
C. | Blind spot | III. | Point of greatest visual acuity or resolution. |
D. | Sclera | IV. | Point where optic nerve leaves the eyeball and photoreceptor cells are absent. |
Options: | A | B | C | D |
1. | II | I | III | IV |
2. | III | I | IV | II |
3. | IV | III | II | I |
4. | I | IV | III | II |
1. | Impulse Transmission across a chemical synapse is always faster than that across an electrical synapse. |
2. | The membranes of presynaptic and postsynaptic neurons are in close proximity in an electrical synapse. |
3. | Electrical synapses are easier to regulate than the chemical synapses. |
4. | Chemical synapses do not use neurotransmitters |
A | Mechanism of vision | Light induces dissociation of the retinal from opsin → change in the structure of the opsin → membrane permeability changes → generation of action potentials in the ganglion cells through the bipolar cells → action potentials are transmitted by the optic nerves to the visual cortex. |
B | Mechanism of hearing | Vibrations are transmitted through the ear ossicles to the round window → vibrations generate waves in the lymphs → this induces a ripple in the Reissner’s membrane → the hair cells press them against the basilar membrane → nerve impulses generated are transmitted to the auditory cortex. |
Identify the correctly matched pairs:
Part of human brain | Function | |
I | Corpus callosum | Tract of nerve fibres connecting two cerebellar hemispheres |
II | Thalamus | Major coordinating centre for sensory and motor signaling |
III | Hypothalamus | Control of body temperature, urge for eating and drinking |
IV | Limbic system | Equilibrium |
V | Medulla | Pneumotaxic centre for regulation of breathing |