Answer:Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells. This process is required to produce egg and sperm cells for sexual reproduction.
Explanation:
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As plasma membrane is semipermeable membrane which allow materials to move across it in both direction. Semi permeable is the reason
Answer:
relaxes
Explanation:
Acetylcholine is the substance responsible for the transmission of nerve impulses from pre-postganglionic neurons, in the ganglia of the autonomic nervous system. At the level of the parasympathetic nervous system, the transmission between the postganglionic neuron and the effector organ also mediates. In addition, it is the mediator of the nerve transmission of the terminal motor plate.
There are large differences in the effects that Acetylcholine triggers at different cholinergic transmission sites
Intra-arterial injection near Acetylcholine produces muscle contraction similar to that caused by motor nerve stimulation. Decreased resting potential in isolated intestinal muscle and increased frequency of spike production, accompanied by increased tension. In the cardiac conduction system, nodes S-A and A-V, it produces inhibition and hyperpolarization of the fiber membrane; and pronounced decrease in depolarization speed. Central regulation of extrapyramidal motor function. Exciting effect of the basal ganglia that counteracts the inhibitory action of Dopamine. Although cholinergic innervation of blood vessels is limited, cholinergic muscarinic receptors occur in sympathetic vasoconstrictor nerves. The vasodilator effect on isolated blood vessels requires the presence of an intact endothelium. The activation of muscarinic receptors causes the release of a vasodilator substance - <u>relaxing factor derived from the endothelium - that diffuses to the smooth muscle producing </u><u>relaxation</u><u>.</u>
<u>Answer:</u>
Part of a strand of DNA with regulatory sequences is Lac gene.
<u>Explanation:</u>
- Genes are the part of DNA that helps in development of traits of individual and helps in inheriting characteristics to offspring.
- In Lac gene(operon, which is fundamental unit of DNA) gene regulation (first genetic regulatory mechanism) was clearly observed for the first time.
- Lac gene is a gene that is required for the 'breakdown of lactose' and also helps in transporting of it.
- There are types of lac genes differing in structure are: LacA, LacY, LacZ.
<span>Some species can hunt in complete darkness using sound alone to guide them to a successful kill.</span>