Q: Q: What do fission reactors use to slow down the neutrons?   Read this paragraph and choose the correct option from the provided answers:  U-235 nuclei can capture neutrons and disintegrate more efficiently if the neutrons are moving slower than the speed at which they are released. Fission reactors use a moderator surrounding the fuel rods to slow down the neutrons. Water is not only a good coolant but also a good moderator, so a common type of fission reactor has the fuel core submerged in a huge pool of water. This type of reactor is called a light water reactor or LWR. All public electricity generating fission reactors in the United States are LWRs.   Choices:  - inertia  - brake  - control  - moderator   A:
A: moderator


Q: Q: Which two systems together provide support to the body and allow for movement?   Read this paragraph and choose the correct option from the provided answers:  16.5 | Musculoskeletal System By the end of this section, you will be able to: • Discuss the axial and appendicular parts of the skeletal system • Explain the role of joints in skeletal movement • Explain the role of muscles in locomotion The muscular and skeletal systems provide support to the body and allow for movement. The bones of the skeleton protect the body’s internal organs and support the weight of the body. The muscles of the muscular system contract and pull on the bones, allowing for movements as diverse as standing, walking, running, and grasping items. Injury or disease affecting the musculoskeletal system can be very debilitating. The most common musculoskeletal diseases worldwide are caused by malnutrition, which can negatively affect development and maintenance of bones and muscles. Other diseases affect the joints, such as arthritis, which can make movement difficult and, in advanced cases, completely impair mobility. Progress in the science of prosthesis design has resulted in the development of artificial joints, with joint replacement surgery in the hips and knees being the most common. Replacement joints for shoulders, elbows, and fingers are also available.   Choices:  - muscular and nervous  - skeletal and digestive  - vascular and muscular  - skeletal and muscular   A:
A: skeletal and muscular


Q: Q: Oxygenated blood is transported by what system?   Read this paragraph and choose the correct option from the provided answers:  Oxygenated blood is transported by the circulatory system from lungs to tissues throughout the body.   Choices:  - skeletal  - nervous  - pulmonary  - circulatory   A:
A: circulatory


Q: Q: What part of blood releases clotting factors?   Read this paragraph and choose the correct option from the provided answers:  Platelets ( Figure below ) are very small, but they are very important in blood clotting. Platelets are not cells. They are sticky little pieces of larger cells. Platelets bud off large cells that stay in the bone marrow. When a blood vessel gets cut, platelets stick to the injured areas. They release chemicals called clotting factors, which cause proteins to form over the wound. This web of proteins catches red blood cells and forms a clot. This clot stops more blood from leaving the body through the cut blood vessel. The clot also stops bacteria from entering the body. Platelets survive in the blood for ten days before they are removed by the liver and spleen.   Choices:  - hemoglobin  - white blood cells  - erythrocytes  - platelets   A:
