Answer the following question given this paragraph: The skeletal system is made up of bones, cartilage, and ligaments. The skeletal system has many important functions in your body. What bones protect the heart and lungs? What protects the brain?. Q: Bones, cartilage, and ligaments make up what anatomical system? Choices: - Integumentary system - Lymphatic system - Muscular system - skeletal system A:
skeletal system
(Question)
Answer the following question given this paragraph: The organs of Corti contain hair cells, which are named for the hair-like stereocilia extending from the cell's apical surfaces (Figure 14.8). The stereocilia are an array of microvilli-like structures arranged from tallest to shortest. Protein fibers tether adjacent hairs together within each array, such that the array will bend in response to movements of the basilar membrane. The stereocilia extend up from the hair cells to the overlying tectorial membrane, which is attached medially to the organ of Corti. When the pressure waves from the scala move the basilar membrane, the tectorial membrane slides across the stereocilia. This bends the stereocilia either toward or away from the tallest member of each array. When the stereocilia bend toward the tallest member of their array, tension in the protein tethers opens ion channels in the hair cell membrane. This will depolarize the hair cell membrane, triggering nerve impulses that travel down the afferent nerve fibers attached to the hair cells. When the stereocilia bend toward the shortest member of their array, the tension on the tethers slackens and the ion channels close. When no sound is present, and the stereocilia are standing straight, a small amount of tension still exists on the tethers, keeping the membrane potential of the hair cell slightly depolarized. Q: When the pressure waves from the scala move the basilar membrane, the tectorial membrane slides across the what? Choices: - dendrites - keratin - cytoplasm - stereocilia A:
(Answer)
stereocilia
Ques: Answer the following question given this paragraph: All machines make work easier, but they don't increase the amount of work that is done. You can never get more work out of a machine than you put into it. In fact, a machine always does less work on an object than the user does on the machine. That's because a machine must use some of the work put into it to overcome friction. Friction is the force that opposes motion between any surfaces that are touching. All machines involve motion, so they all have friction. How much work is needed to overcome friction in a machine depends on the machine's efficiency. Q: What is the term for force that opposes motion between any touching surfaces? Choices: - gravity - stress - tension - friction A:
Ans: friction
(Q).
Answer the following question given this paragraph: Movable joints allow the greatest movement and are the most common. In these joints, the bones are connected by ligaments. The surfaces of the bones at the joints are covered with a smooth layer of cartilage. It reduces friction between the bones when they move. The space between the bones is also filled with a liquid called synovial fluid. It helps to cushion the bones. There are several different types of movable joints. You can see three of them in Figure below . Move these three joints in your own skeleton to experience the range of motion each allows. Q: The surfaces of the bones at the joints are covered with a smooth layer of cartilage, which reduces what force between the bones when they move? Choices: - vibration - expulsion - gravity - friction A:
(A).
friction
Ques:Answer the following question given this paragraph: Radioactivity is quantified by measuring the number of decay processes per unit time. For example, we can measure radioactivity in terms of counts per minute (cpm), where each "count" is a single decay process, such as the emission of an -particle. A sample of one particular isotope may have an activity of 5,000 cpm, while an equal amount of another isotope might result in a radiation level of only 250 cpm. For a given nucleus, the amount of radioactivity gives a rough indication of the amount of the radioisotope present the higher the activity, the more of the radioactive isotope in the sample. Q: What is quantified by measuring the number of decay processes per unit time? Choices: - temperature - microwave power - fossil age - radioactivity A:

Ans:radioactivity
Question: Answer the following question given this paragraph: Protists use cilia, pseudopods, or flagella to move. Q: What organisms use cilia, pseudopods, or flagella to move? Choices: - bacteria - arthropods - prokaryotes - protists A:
Answer:
protists