Which of the following regarding blood vessels is not true? Group of answer choices

arteries have valves to jprevent backflow

Arteries have thick, elastic walls to accommodate the high pressure of blood pumped from the heart

In the thinner-walled veins, blood flows back to the heart mainly as a result of muscle action

Arteries and veins have an endothelium, smooth muscle, and connective tissue

After frida stops exercising, she continues to breathe heavily. what is most likely occurring in her body? heavy breathing during exercise has produced an oxygen surplus in her muscles. this oxygen is being transported to her lungs. this is a result of aerobic respiration. heavy breathing during exercise has produced a carbon dioxide surplus in her muscles. lactate is being transported to her liver. this is a result of aerobic respiration. strenuous exercise has caused her body to be in carbon dioxide debt, and she is breathing hard while lactate is transported to the liver. this is a result of anaerobic respiration. strenuous exercise has caused her body to be in oxygen debt, and she is breathing hard while lactate is transported to the liver. this is a result of anaerobic respiration.