<span>The question says,'the beginning of every workout should start with .......... The correct option is A. Work outs should start with warming up, this gently prepare the body for exercise by increasing the heart beat rate and circulation, this loosen the joints and increase the blood flow rate to the muscles. Strectching the muscles prepare them for exertion and prevent injuries.</span><span />
Answer:
all of them
Explanation:
The five components of physical fitness are cardiovascular endurance, muscular strength, muscular endurance, flexibility and body composition, according to Fit Day. There is unanimous agreement in the fitness community that these are the five components of physical fitness, though the definition of what level of fitness needs to be achieved is a personal one.
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.
Their mode of fertilization is external.
They lay eggs in the water and there is a chance of destruction of these gametes by water current if they are in less quantity.
So they lay more and more eggs in order to rule out the possibility of destruction of all eggs.
Thus at least some eggs are fertilized by sperm and produce zygote.
