Q: In the presence of oxygen, hydrogen can interact to make what? Read this paragraph and choose the correct option from the provided answers: A pile of leaves slowly rots in the backyard. In the presence of oxygen, hydrogen can interact to make water. Gold can be stretched into very thin wires. Choices: - carbon - helium - acid - water A:
water

Q: In humans, the sperm cell is the only cell with what structure that enables motility? Read this paragraph and choose the correct option from the provided answers: The Cytoskeleton Much like the bony skeleton structurally supports the human body, the cytoskeleton helps the cells to maintain their structural integrity. The cytoskeleton is a group of fibrous proteins that provide structural support for cells, but this is only one of the functions of the cytoskeleton. Cytoskeletal components are also critical for cell motility, cell reproduction, and transportation of substances within the cell. The cytoskeleton forms a complex thread-like network throughout the cell consisting of three different kinds of proteinbased filaments: microfilaments, intermediate filaments, and microtubules (Figure 3.18). The thickest of the three is the microtubule, a structural filament composed of subunits of a protein called tubulin. Microtubules maintain cell shape and structure, help resist compression of the cell, and play a role in positioning the organelles within the cell. Microtubules also make up two types of cellular appendages important for motion: cilia and flagella. Cilia are found on many cells of the body, including the epithelial cells that line the airways of the respiratory system. Cilia move rhythmically; they beat constantly, moving waste materials such as dust, mucus, and bacteria upward through the airways, away from the lungs and toward the mouth. Beating cilia on cells in the female fallopian tubes move egg cells from the ovary towards the uterus. A flagellum (plural = flagella) is an appendage larger than a cilium and specialized for cell locomotion. The only flagellated cell in humans is the sperm cell that must propel itself towards female egg cells. Choices: - eukaryotic - False Cell - sporangia - flagella A:
flagella

Q: Q: Mass multiplied by velocity equals what force? Read this paragraph and choose the correct option from the provided answers: - Momentum equals mass multiplied by velocity. It is a vector, direction must be considered. Always define a positive direction and be consistent. Choices: - kinetic energy - bounce - inertia - momentum A:
A: momentum

Question: Q: What type of cell transmits electrical impulses in the nervous system? Read this paragraph and choose the correct option from the provided answers: cell that transmits electrical impulses in the nervous system; commonly called nerve cell. Choices: - toxin cell - Large Cell - trace cell - nerve cell A:
Answer: nerve cell

*Question*
Q: An isometric type of what occurs as the muscle produces tension without changing the angle of a skeletal joint? Read this paragraph and choose the correct option from the provided answers: 10.4 | Nervous System Control of Muscle Tension By the end of this section, you will be able to: Explain concentric, isotonic, and eccentric contractions Describe the length-tension relationship Describe the three phases of a muscle twitch Define wave summation, tetanus, and treppe To move an object, referred to as load, the sarcomeres in the muscle fibers of the skeletal muscle must shorten. The force generated by the contraction of the muscle (or shortening of the sarcomeres) is called muscle tension. However, muscle tension also is generated when the muscle is contracting against a load that does not move, resulting in two main types of skeletal muscle contractions: isotonic contractions and isometric contractions. In isotonic contractions, where the tension in the muscle stays constant, a load is moved as the length of the muscle changes (shortens). There are two types of isotonic contractions: concentric and eccentric. A concentric contraction involves the muscle shortening to move a load. An example of this is the biceps brachii muscle contracting when a hand weight is brought upward with increasing muscle tension. As the biceps brachii contract, the angle of the elbow joint decreases as the forearm is brought toward the body. Here, the biceps brachii contracts as sarcomeres in its muscle fibers are shortening and cross-bridges form; the myosin heads pull the actin. An eccentric contraction occurs as the muscle tension diminishes and the muscle lengthens. In this case, the hand weight is lowered in a slow and controlled manner as the amount of crossbridges being activated by nervous system stimulation decreases. In this case, as tension is released from the biceps brachii, the angle of the elbow joint increases. Eccentric contractions are also used for movement and balance of the body. An isometric contraction occurs as the muscle produces tension without changing the angle of a skeletal joint. Isometric contractions involve sarcomere shortening and increasing muscle tension, but do not move a... Choices: - compression - extension - acceleration - contraction A:
**Answer**
contraction

(Q).
Q: Concentration of what, the substance left behind when ocean water evaporates, is about 3.5 percent? Read this paragraph and choose the correct option from the provided answers: Dissolved mineral salts wash into the ocean. As ocean water evaporates, it leaves the salts behind. This makes the water saltier. Ocean water is about 3.5 percent salts. The main salt is sodium chloride. Choices: - hydrogen - sugar - quartz - salts A:
(A).
salts