Answer the following question given this paragraph: CHAPTER REVIEW 20.1 Structure and Function of Blood Vessels Blood pumped by the heart flows through a series of vessels known as arteries, arterioles, capillaries, venules, and veins before returning to the heart. Arteries transport blood away from the heart and branch into smaller vessels, forming arterioles. Arterioles distribute blood to capillary beds, the sites of exchange with the body tissues. Capillaries lead back to small vessels known as venules that flow into the larger veins and eventually back to the heart. The arterial system is a relatively high-pressure system, so arteries have thick walls that appear round in cross section. The venous system is a lower-pressure system, containing veins that have larger lumens and thinner walls. They often appear flattened. Arteries, arterioles, venules, and veins are composed of three tunics known as the tunica intima, tunica media, and tunica externa. Capillaries have only a tunica intima layer. The tunica intima is a thin layer composed of a simple squamous epithelium known as endothelium and a small amount of connective tissue. The tunica media is a thicker area composed of variable amounts of smooth muscle and connective tissue. It is the thickest layer in all but the largest arteries. The tunica externa is primarily a layer of connective tissue, although in veins, it also contains some smooth muscle. Blood flow through vessels can be dramatically influenced by vasoconstriction and vasodilation in their walls. Q: Blood vessels blood pumped by the heart flows through a series of vessels known as arteries, arterioles, capillaries, venules, and veins before returning to this? Choices: - lungs - feet - brain - heart A:
heart
(Question)
Answer the following question given this paragraph: About 85 percent of teens develop acne, like the boy in Figure below . Acne is a condition in which pimples form on the skin. It is caused by a bacterial infection. It happens when the sebaceous glands secrete too much sebum. The excess oil provides a good place for bacteria to grow. Keeping the skin clean helps prevent acne. Over-the-counter products or prescription drugs may be needed if the problem is serious or doesn't clear up on its own. Q: What is the condition called where pimples form on the skin? Choices: - blushing - cramping - dermatitis - acne A:
(Answer)
acne
Ques: Answer the following question given this paragraph: There are many other examples of redox reactions in which two neutral elements combine to make a compound. These often take the form of a metal being oxidized and a nonmetal being reduced, resulting in an ionic compound. Two nonmetallic elements can also undergo a redox reaction of this type, in which the less electronegative element is oxidized and the more electronegative element is reduced. Q: When a metal is oxidized and a nonmetal is reduced in a redox reaction, what is the resulting compound called? Choices: - soluble compound - alloy - magnetic compound - ionic compound A:
Ans: ionic compound
(Q).
Answer the following question given this paragraph: More than 1000 different enzymes are necessary for human life. Many enzymes are needed for the digestion of food. Two examples are amylase and pepsin. Both are described in the Figure below . Q: Amylase and pepsin are examples of enzymes needed for what process? Choices: - fermentation - absorption - filtration - digestion A:
(A).
digestion
Ques:Answer the following question given this paragraph: Q: What creates charged regions in a water molecule? Choices: - nonpolar bonds - ionic bonds - noncovalent bonds - polar covalent bonds A:

Ans:polar covalent bonds
Answer the following question given this paragraph: However, out of all this secrecy came several contributions to modern-day chemistry. Early acids and bases were discovered. Glassware for running chemical reactions was developed. Alchemy helped improve the study of metallurgy and the extraction of metals from ores. More systematic approaches to research were being developed, although the idea of orderly scientific experimentation had not become well-established yet. But the groundwork was laid to the development of chemistry as a foundational science. Q: Alchemy helped improve the study of metallurgy and the extraction of metals from what? Choices: - air - water - wood - ores A:
ores