Answer:
The process of reuptake occurs when the sending neuron normally reabsorbs excess neurotransmitter molecules.
Explanation:
The process of reuptake takes place when a cell that initially produced and emitted a particular substance reabsorbs it again. Serotonin is one of the secretions affected by this process since it can be reabsorbed if it sticks to receptors located in the original nerve where it was produced to be then released once again.
Answer:
B) The "lub-dub" sound originates from blood turbulence through the heart.
Explanation:
The systole and diastole in the heart produce the lub and dub sound in the heart.
The systole represents the contraction of both left and right ventricles and pumps the blood to the body and the right ventricle to the lungs. This involves the opening and closing of the valves. The closing of the atrioventricular valves produces lub sound.
At the end of the systole or ventricular contraction or when the blood has been pumped to the aorta and the pulmonary valves then the semilunar valves present in the aorta and pulmonary closes. This produces a sound dub.
Therefore,lub dub is associated with the physical contraction of the heart but not the turbulence of the blood.
Thus, the selected option is the correct answer.
Answer:
Zygote
Explanation:
A zygote is a (diploid) cell formed through fertilization between two gametes. Zygote cells are eukaryotic, and in the human body, they are the first cell stage of pregnancy.
Have a lovely rest of your day/night, and good luck with your assignments! ♡
It has enhanced our knowledge in the science world greatly. Many cell organelles and chemical processes can be studied in more detail using the electron microscope.
Smoking is one of the major reason of Lung cancer. But one may have cancer even if the individual is not a smoker due to radiation, secondary air pollutants.
<h3> What is cancer?</h3>
Cancer is described as the uncontrolled and abnormal growth of cells in one’s body which are arrested in the growth phase of the cell cycle and multiply rapidly and does not mature like normal cells, cancer is more aggressive form of a tumour.
The following describe the relation of smoking with lung cancer
- Cancer is caused by oncogenes activating substances [OAS] some of them causes mutation in the body
- These oncogenic substances in the smoke produced while smoking contains nicotine, hydrocarbons, cyclohydrocarbons and various other factors which converts normal cells into cancerous cells
- Hence,
- smoking
- causes
- oral
- and
- lung
- cancer
Learn more about Lung cancer
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