Distinguish between the functions of the white and gray matter of the spinal cord. How is the functional difference associated with a color difference?
What will be an ideal response?
The white matter consists of the axons of the nerves surrounded by their myelin sheaths. The myelin is primarily made up of membrane lipids, and the fatty materials in these lipids make the sheath look white. The gray matter contains the cell bodies with organelles and unsheathed synapsing dendrites and axons. Compared to myelin, this material has little lipid. The cellular constituents absorb light and tend to make this region look gray.
You might also like to view...
Match the following items with the correct phrases.
_______1. In addition to standard precautions, ____________________ must be used when managing a patient with streptococcal pneumonia. _______2. The goal of ____________________ is to render and keep objects and areas sterile. _______3. In addition to standard precautions, ____________________ must be used when managing a tuberculosis patient. _______4. The goal of ____________________ is to reduce the number and transmission of pathogens. _______5. In addition to standard precautions, ____________________ must be used when managing a Clostridium difficile–associated disease. a. airborne precautions b. contact precautions c. droplet precautions d. medical aseptic technique e. surgical aseptic technique
A moth species is known for its unusual flying behavior, which includes sudden vertical drops and horizontal zigzags. Not much is known about the cause of this behavior. What could you study to better understand the proximate basis of this behavior? (Check all that apply)
Lepidopterans (moths and butterflies) sometimes have specialized flying behaviors. Some moths have the ability to do sudden vertical drops when they detect bat sonar, to avoid being eaten. Other species use special flying techniques to attract a mate. When biologists talk about the "cause" of a behavior, they may be referring to two different things. The proximate cause is the sequence of physiological events that lead to the behavior in an individual. The ultimate cause is the adaptive benefit to the animal that allowed natural selection to sculpt the behavior over evolutionary time. Understanding both the proximate and ultimate basis of behavior is important, and different types of biologists may focus on each. _____ brain structure _____ flying behavior in related species _____ hormones _____ mating behavior _____ physiology _____ predation _____ sensory organs _____ wing muscle development Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about proximate causes of a behavior? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Kinesins, dyneins, and myosins are all
a. components of microtubules. b. components of microfilaments. c. components of intermediate filaments. d. motor proteins. e. involved in moving chromosomes.
The dark chemical that accumulates in the skin after exposure to the sun is called ________
A) melanocyte B) sebum C) melanin D) carcinoma