An artery branches into a blood vessel of smaller diameter called a(n) , which conducts blood into a network of capillaries. 2. blood travels along the circuit when it passes from the heart to the lungs and then back to the heart. 3. invertebrates with an open circulatory system have a body cavity called a(n) , which contains a blood-like fluid that bathes body tissues directly. 4. a(n) , or white blood cell, is larger than a red blood cell but is able to fit through much narrower spaces. 5. a(n) is a red blood cell. its red color is produced by the iron-containing protein , which transports most of the blood's oxygen. 6. the heart's valves open when the ventricles contract, allowing blood to enter the pulmonary artery and the aorta. 7. when the heart's valves open, blood can flow from the atria into the ventricles.

a lack of sleep can affect body weight. two hormones in the body, leptin and ghrelin, control feelings of hunger and satiety, or fullness.

explanation:

my questions are always answered on spot you know whats the

you gotta always put the reward points high. if you r question takes long to answer and the reward points is just 5, then almost nobody will likely want to answer your question.

also, if your question is unclear, lacks information, nobody gonna answer.

people prefer multiple choice the best, its easy and quick when multiple choices questions. if you have long sentence questions on stories, essay, etc., then you have to at least give them as much points as possible.

it kinda like bounty , the question with most reward prize and the easiest to pull off will get

hope this

just saying your question will get reported and deleted an my answer too