The papillary muscles of both right and left ventricles began to contract shortly before the other ventricular muscles (systole) so that they can take up the slack on the chordae tendineae as the full force of ventricular contractions sends blood against the atrioventricular (AV) valve flaps.

They prevent the backward flow of blood to atria from ventricles. So if they contract after the ventricle systole they would not be able to perform their job.

8 0

3 years ago

How is free water different from solute bound water (the key concept)?

Romashka [77]

Answer:

<h3><em>Water that can be extracted easily from foods by squeezing or cutting or pressing is known as free water, whereas water that cannot be extracted easily is termed as bound water.</em></h3>

4 0

3 years ago

The students decided that they would investigate some of the abiotic factors. list three water-quality tests that could be condu

Ostrovityanka [42]

<span>One test might be the acid content of the water. Water that does not have a neutral pH might be less conducive to life. Another water quality test might be oxygen levels in the water. Inadequate oxygen levels may also reduce the amount of aquatic life. The presence of pollutants might be a third test. Chemicals that poison the water would negatively impact the number and variety of organisms present.</span>

8 0

4 years ago

PIT_PIT [208]

Transport protein cytoskeleton microtubule

6 0

3 years ago