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.
Answer:
A single gene form different isoforms of protein that result from the alternative splicing of pre-mRNA sequences. one gene many polypeptide hypothesis applies here very well. This whole process helps in proliferating informational diversity and functional capacity of a gene that'll ultimately he;p in gene regulation.
This alternative splicing of pre-mRNA also produces proteomic diversity that result in various development states as well as various disease conditions later.
Answer:
The hormone oxytocin aids the birth process by stimulating: uterine wall contractions.
Explanation:
Oxytocin is a hormone that is released naturally in the body of women and that intervenes in certain physiological processes, activating behaviors at a mechanical level in specific organs such as the uterus and the breasts. In the case of the uterus, oxytocin stimulates and maintains the contraction of the smooth muscle of the uterus during labor and delivery, that is, it is responsible for the existence of contractions, which occur during intercourse, due to the distension of the uterus that occurs produced during labor.
The cells of animals, plants, and fungi, as well as those of algae and other protists, all engage in cellular respiration.
- Cellular respiration is the process that all living things use to convert organic molecules into energy.
- The chemical process that breaks down food molecules to produce adenosine triphosphate, which is used for energy, is known as cellular respiration (ATP). As a result, organisms can now use energy from food molecules to perform everyday tasks.
- Oxygen is normally present when cells respire. This is called aerobic respiration. Anaerobic respiration occurs when oxygen is absent or present in very small amounts.
- Anaerobic respiration is essential to the life of some organisms, including many bacteria. Yeast and some bacteria use an anaerobic respiration process known as fermentation. The cellular respiration equation describes the process by which glucose molecules combine with oxygen to produce energy.
Therefore, all most all organisms use cellular respiration.
Learn more about cellular respiration:
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Hello!
Chemical reactions require energy to begin. The reactants must collide with enough energy for bonds to change. This energy is known as activation energy - the difference in energy between that of the reactants and the amount needed for the reaction to occur.
Catalysts lower the activation energy needed for a chemical reaction to occur, therefore also increasing the rate of a reaction. Enzymes are proteins which act as catalysts within cells.
Therefore, enzymes cause the activation energy to lower.
Hope this helps!
