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:
friction
Answer the following question given this paragraph: An atomic bomb explodes and generates a huge mushroom cloud. The tremendous energy released when the bomb explodes is incredibly destructive. Where does all the energy come from? The answer is the nucleus of the atom. Q: Where does the energy from an atomic bomb come from? Choices: - isotope of atom - electron shell - neutron - nucleus of atom A:
nucleus of atom
Q: Answer the following question given this paragraph: At divergent plate boundaries hot mantle rock rises into the space where the plates are moving apart. As the hot mantle rock rises, it goes from higher to lower pressure. This is because there is no longer the weight of all the rock above it. Lower pressure lowers the melting temperature of the rock (2 in the previous section). This is why there is volcanism at divergent plate boundaries. Lava erupts through long cracks in the ground, or fissures. Q: Lava erupts through long cracks in the ground, also called what? Choices: - ridges - crevasses - faults - fissures A:
A: fissures
Question: Answer the following question given this paragraph: Q: Is urea or salt reabsorbed faster? Choices: - same speed - neither is reabsorbed - urea - salt A:
Answer: salt
*Question*
Answer the following question given this paragraph: (PRL) in females. Prolactin stimulates the production of milk by the mammary glands following childbirth. Prolactin levels are regulated by the hypothalamic hormones prolactin-releasing hormone (PRH) and prolactin-inhibiting hormone (PIH) which is now known to be dopamine. PRH stimulates the release of prolactin and PIH inhibits it. The posterior pituitary releases the hormone oxytocin, which stimulates contractions during childbirth. The uterine smooth muscles are not very sensitive to oxytocin until late in pregnancy when the number of oxytocin receptors in the uterus peaks. Stretching of tissues in the uterus and vagina stimulates oxytocin release in childbirth. Contractions increase in intensity as blood levels of oxytocin rise until the birth is complete. 22 Hormone production and release are primarily controlled by negative feedback. In negative feedback systems, a stimulus causes the release of a substance whose effects then inhibit further release. In this way, the concentration of hormones in blood is maintained within a narrow range. For example, the anterior pituitary signals the thyroid to release thyroid hormones. Increasing levels of these hormones in the blood then feed back to the hypothalamus and anterior pituitary to inhibit further signaling to the thyroid gland. 24 The main mineralocorticoid is aldosterone, which regulates the concentration of ions in urine, sweat, and saliva. Aldosterone release from the adrenal cortex is stimulated by a decrease in blood concentrations of sodium ions, blood volume, or blood pressure, or an increase in blood potassium levels. Q: What stimulates the production of milk by the mammary glands following childbirth? Choices: - progesterone - estrogen - melanin - prolactin A:
**Answer**
prolactin
Answer the following question given this paragraph: Harmful mutations can result in errors in protein sequence, creating partially or completely non-functional proteins. Q: Harmful instances of what can result in errors in protein sequence that yield non-functional proteins? Choices: - infection - bioaccumulation - radiation - mutation A:
mutation