Answer:
b. It keeps alveoli from collapsing with breaths.
Explanation:
Surfactants are highly surface active agents which are formed from a protein and lipid complex. It comprises of a hydrophobic and hydrophilic portion and its sole purpose is to control the tension at the air-liquid interface and thereby lower the surface tension. Surfactants are produced by the type II aveolar pneumocytes in the lungs.
Surfactants are needed in order to aid breathing and prevent straining oneself, it also prevents the lungs from collapsing during breathing, a term known as atelectasis.
D. Epinephrine (adrenaline) is a monoamine produced in the adrenal medulla.
Answer:
Most reactions occur quickly after ingestion or contact with the allergen, but some can occur up to a few hours later. There can also be a second phase of the reaction when symptoms reoccur. It is important to keep an eye on your child for about 6-8 hours following the first reaction.
Ignore(SC:GL)
The retina; more specifically the photoreceptors which are specialised cells in the retina.
Answer;
The best explanation to the above question would be;
-Sustained physical activity allows the body to work its muscles while providing oxygen to the muscle groups. This activity develops the muscle groups in addition to the cardiovascular and respiratory systems that deliver oxygen to the muscles via blood circulation.
-Sustained physical activity exercises all these systems in concert and improves cardio-respiratory fitness levels.
-Additionally; exercise such as running, cycling and walking uses energy, and when energy expenditure exceeds energy intake, the difference is made up by burning fat. Thus, improving one's cardio respiratory fitness and muscular strength and endurance can help improve one's body composition by changing the ratio of body tissue to fat.
