Answer the following question given this paragraph: A heart attack happens when the blood cannot reach the heart because a blood vessel is blocked. If cardiac muscle is starved of oxygen for more than roughly five minutes, it will die. Cardiac muscle cells cannot be replaced, so once they die, they are dead forever. Coronary heart disease is the leading cause of death of adults in the United States. The image below shows the way in which a blocked coronary artery can cause a heart attack and cause part of the heart muscle to die ( Figure below ). Maybe one day stem cells will be used to replace dead cardiac muscle cells. Q: What happens when the blood cannot reach the heart because a blood vessel is blocked? Choices: - fast heart beat - heart burn - pass out - heart attack A:
heart attack
Answer the following question given this paragraph: Find the microwave in the Figure above . A microwave is an electromagnetic wave with a relatively long wavelength and low frequency. Microwaves are often classified as radio waves, but they have higher frequencies than other radio waves. With higher frequencies, they also have more energy. That's why microwaves are useful for heating food in microwave ovens. Microwaves have other important uses as well, including cell phone transmissions and radar. These uses are described below. You can learn more about microwaves and their uses in the video at this URL: http://www. youtube. com/watch?v=YgQQb1BVnu8 . Q: Why do microwaves have a higher energy than radio waves? Choices: - higher resonance - lower frequency - higher decibel - higher frequency A:
higher frequency
Q: Answer the following question given this paragraph: Organs of excretion make up the excretory system. They include the kidneys, large intestine, liver, skin, and lungs. Q: Kidneys, large intestine, liver, skin, and lungs comprise which system? Choices: - Muscular system - Digestive system - Lymphatic system - excretory system A:
A: excretory system
Question: Answer the following question given this paragraph: Kinetic and potential energy add up to mechanical energy. Q: Mechanical energy can also usually be expressed as the sum of kinetic energy and what other kind of energy? Choices: - reflective energy - directional energy - partial energy - potential energy A:
Answer: potential energy
*Question*
Answer the following question given this paragraph: Enzymes may also allow reactions to occur by different pathways that have lower activation energy. Q: What catalyst substances may also allow reactions to occur by different pathways that have lower activation energy? Choices: - carbohydrates - hormones - calories - enzymes A:
**Answer**
enzymes
Q: Answer the following question given this paragraph: A magnet is an object that attracts certain materials such as iron. You're probably familiar with common bar magnets, like the one shown in the Figure below . Like all magnets, this bar magnet has north and south magnetic poles . The red end of the magnet is the north pole and the blue end is the south pole. The poles are regions where the magnet is strongest. The poles are called north and south because they always line up with Earth's north-south axis if the magnet is allowed to move freely. (Earth's axis is the imaginary line around which the planet rotates. ). Q: What are the earth's two poles called? Choices: - southwest and south - east and west - west and south - north and south A:
A: north and south