STD 11 - 19. Chemical coordination and integration — NEET STD 11 Science — Question

The product of Monascus purpureus has been commercialised as

Human urine is invariably acidic because

Heart beats are affected by

Which statements are incorrect for mechanisms of nerve impulse conduction along electrical junctions of neuron or electrical synapse ?
(i) Nerve impulse flow directly from one neuron to other across the synapses in electrical synapses.
(ii) Transmission of an impulse across electrical synapses is very similar to impulse conduction along a single axon.
(iii) Impulse transmission across an electrical synapse is always faster than that across a chemical synapse.
(iv) Electrical synapses are rare in our system.
(v) At an electrical synapse, the membranes of the pre and post-synaptic neurons are separated by a fluid-filled space called synaptic cleft is thick.
(vi) Chemicals called neurotransmitters are involved in the transmission of impulses at this synapse.

Pleural membrane is covering of

Which of the following statements about methanogens is not correct?

The nerve centres which control the body temperature and the urge for eating are contained in

Which type of scales are found on the skin of cartilaginous fishes?

Autorhythmicity is a special property of the muscles of the