Answer the following question given this paragraph: Glia While glia are often thought of as the supporting cast of the nervous system, the number of glial cells in the brain actually outnumbers the number of neurons by a factor of ten. Neurons would be unable to function without the vital roles that are fulfilled by these glial cells. Glia guide developing neurons to their destinations, buffer ions and chemicals that would otherwise harm neurons, and provide myelin sheaths around axons. Scientists have recently discovered that they also play a role in responding to nerve activity and modulating communication between nerve cells. When glia do not function properly, the result can be disastrousmost brain tumors are caused by mutations in glia. Types of Glia There are several different types of glia with different functions, two of which are shown in Figure 35.7. Astrocytes, shown in Figure 35.8a make contact with both capillaries and neurons in the CNS. They provide nutrients and other substances to neurons, regulate the concentrations of ions and chemicals in the extracellular fluid, and provide structural support for synapses. Astrocytes also form the blood-brain barriera structure that blocks entrance of toxic substances into the brain. Astrocytes, in particular, have been shown through calcium imaging experiments to become active in response to nerve activity, transmit calcium waves between astrocytes, and modulate the activity of surrounding synapses. Satellite glia provide nutrients and structural support for neurons in the PNS. Microglia scavenge and degrade dead cells and protect the brain from invading microorganisms. Oligodendrocytes, shown in Figure 35.8b form myelin sheaths around axons in the CNS. One axon can be myelinated by several oligodendrocytes, and one oligodendrocyte can provide myelin for multiple neurons. This is distinctive from the PNS where a single Schwann cell provides myelin for only one axon as the entire Schwann cell surrounds the axon. Radial glia serve as scaffolds for developing neurons as they migrate to their end... Q: Though often regarded as the supporting cast of the nervous system, glial cells in the brain actually outnumber what by a factor of ten? Choices: - blood cells - electrons - muscles - neurons A:
neurons
(Question)
Answer the following question given this paragraph: Q: The golgi removes some sugar monomers and substitutes others, producing a large variety of what? Choices: - electrolytes - fats - proteins - carbohydrates A:
(Answer)
carbohydrates
Ques: Answer the following question given this paragraph: The biggest particles, including gravel and pebbles, are moved by traction . In this process, the particles roll or drag along the bottom of the water. Q: What is the process that moves particles by rolling or dragging along the bottom of the water? Choices: - compaction - compression - isolation - traction A:
Ans: traction
(Q).
Answer the following question given this paragraph: Sexual reproduction occurs in a cycle. Diploid parents produce haploid gametes that unite and develop into diploid adults, which repeat the cycle. This series of life stages and events that a sexually reproducing organism goes through is called its life cycle . Sexually reproducing organisms can have different types of life cycles. Three are described in the following sections. Q: This series of life stages and events that a sexually reproducing organism goes through is called its what? Choices: - maturation cycle - development cycle - formative period - life cycle A:
(A).
life cycle
Ques:Answer the following question given this paragraph: Earth goes through regular changes in its position relative to the Sun. Its orbit changes slightly. Earth also wobbles on its axis of rotation. The planet also changes its axial tilt , the angle of its axis of rotation. These changes can affect Earth's temperature. Q: What do you call the angle of the earth's axis of rotation? Choices: - dynamic tilt - vertical tilt - horizontal tilt - axial tilt A:

Ans:axial tilt
Answer the following question given this paragraph: When iron filings and sulfur powder are mixed together in any ratio, they form a mixture. No chemical reaction occurs, and both elements retain their individual properties. A magnet can be used to mechanically separate the two elements by attracting the iron filings out of the mixture and leaving the sulfur behind. Q: What can be used to mechanically separate the two elements by attracting the iron filings out of the mixture and leaving the sulfur behind? Choices: - centrifuge - laser - graduated cylinder - magnet A:
magnet