Answer:
- Blood travels at a higher velocity in arteries than in veins.
- The volume of blood flow in the arteries and arterioles is greater than the volume of blood flow through the capillaries
- Blood pressure is higher in arteries than in veins.
- The total cross-sectional area of the capillaries is greater than the total cross-sectional area of the venules and veins
Explanation:
The lumen of arteries is larger than that of arterioles and capillaries. However, even though they have a smaller lumen compared to veins, their walls are thicker to bear the pressure of the blood as it is pumped by the heart to the tissues. Therefore the blood pressure and velocity of blood in arteries (that pump blood away from the heart) is higher than in capillaries and veins. Veins take blood back to the heart from tissues hence this blood is under lower pressure and velocity. This is why veins have valves to prevent the back-flow of blood against gravity.
Due to the large cross-section area of capillaries the blood flow is here is slower hence giving time for blood to linger a bit so there is an exchange of materials between the blood plasma and the interstitial fluids that nourish the cells.
I'm not entirely sure and this response is late but I'm pretty sure it's when the central vacuoles lose their water and can no longer support the cell. When the vacuole of a cell is full it pushes outward against the cell wall. When it has nothing in it, you can assume that because the vacuole is so big and is such a big component of this that this would be the answer.
The correct answer among all the other choices is "Since the pollen tubes cannot grow long enough to reach the eggs, the mutation will not be passed on and will not affect the plant population." Thank you for posting your question. I hope that this answer helped you. Let me know if you need more help.
So it doesn't accidently get caught and knocked off the table.
The pit that marks the location of the umbilical cord after birth is known as the navel or belly button. All animals that grow placenta during fetal development will have a navel or belly button. The scientific name of the structure is the umbillicus. It can be a depression in some individuals or raised in others.
