Answer:
The correct answer will be option-C
Explanation:
The rhythm of the heartbeat is controlled by the pacemaker of the heart called the sino-atrial node.
The SA node generates action potentials which trigger the contraction and relaxation of the atrium and ventricles. The membrane potential generation initiates by the depolarization of the cell membrane when the L type of Ca⁺² ions opens up and calcium ions enter the cell.
This depolarizes the cell until the potential threshold is reached which lies between the -40 and -30 mV.
Thus, Option-C is the correct answer.
Eukaryotes are organisms who is containing a nucleus, cells and other organelles that are enclosed with membranes just like the prokaryotes does. Eukaryotes are able to reproduce asexually through the process of mitosis and sexually through the process of meiosis.
Answer:
The correct statement is C. The pollutants will disrupt oxygen absorption in fish.
Explanation:
Motor oil and other fuels when dispose off in the water bodies, it causes suffocation in the marine animals and causes death. Motor oil or other fuel such as petrol, diesel etc are non polar solvent and water is a polar solvent so they are not dissolve with each other and the oil make a layer on the water surface and blocks oxygen.
