Biology

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Biology

Postby love20 » Fri Dec 04, 2015 9:50 pm

There is a loud crash in the room behind you and you jump. which part of your nervous system caused that response/ A. somatic nervous system?
C. central nervous system
D. sympathetic branch
E. parasympathetic branch
My teacher told me b was wrong so thats why it's missing
why are reflexes faster than typical body responses to stimuli?
A. the circuit from stimulus to response travels directly from the spinal column to the brain
B. a reflexive response involves just the somatic system
D. the circuit from stimulus to response doesn't go through the brain first
E. a reflex involves the cranial nerves which operates more quickly than other nerves
new species evolve fro older ones. Why is it difficult to demonstrate this process?
what is the surface are of an alveoli?
How is it possible for a mutation to be beneficial and what happens to it if it is?
A. a mutation by defenition is not beneficial
B. and disappear from the population
It is not possible for a mutation to be beneficial and so the mutated gene will be selected against
C. A mutation that results in a trait that improves an organisms fitness is beneficial and because it has improved fitness that mutated gene will spread in the population
D. A mutation can result in a trait that is beneficial to an individual or its offspring and it will stay within that family
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Re: Biology

Postby DarianC » Mon Dec 07, 2015 12:42 pm

Do you still need help on these? We apologize for the delay in a response.

D
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Re: Biology

Postby DrPhil » Mon Dec 07, 2015 4:26 pm

Different texts may use different words to describe parts of the nervous system. That is one reason we have to see your work - to know what words mean what.

Also, you have a tendency to ask for answers rather than help with your answers. Which choices have you eliminated as being way off the mark? If you can eliminate two of four, it is much easier to consider the pros and cons of the remaining choices.

Central Nervous System (CNS) consists of the brain and the spinal cord.

"Soma" means the whole body. The "somatic nervous system" is concerned with control of voluntary muscles AND sensing the environment.

"Autonomic nervous system" is the involuntary (or visceral) division -- what keeps going even when you are not conscious.

"Sympathetic nervous system" deals with smooth muscle (e.g., the heart) and glands - it is involved with preparation for "fight or flight."

"Parasympathetic" pertains to the craniosacrol portion of the autonomic nervous system -- I hope your text has a more simple definition than that!

If you need more help, SHOW US WHAT YOU HAVE DONE. What definitions have you found? What choices eliminated for each question? What are your best guesses?

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