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:
(D)
Explanation:
Just took the test on edge
Answer:
The ways in which teen pregnancy can be addressed are as follows:
1. Special prenatal care is needed and health care centres should be visited frequently for a checkup.
2. The teen should also undergo tests for STD or Sexually transmitted diseases.
3. Toxic substances such as alcohol, tobacco, etc. should be avoided.
4. Eat a proper balanced diet and stay physically active.
5. The teen should be made aware of all the associated health risks and other factors associated with pregnancy.
Explanation:
I'm not sure but hope it helps.
Answer:
The most appropriate way of sharing the results is to publish in a scientific journal for peer review. So the answer is 'B'.
Explanation:
In order to validate your results in the scientific community, it is best to publish in a <em>scientific journal</em> and get it peer reviewed. When the article is peer reviewed, other scientists of <em>higher caliber</em> verify your experiment and results and then give their verdict to the outside world.
Newspapers sometimes also <em>publish rumors</em>. So there is no guarantee what gets published is true. the students are still learning and cannot appreciate the full extent of your work.
