Biology - February 2007

biology project. help!

2007-02-26 04:34:01 · 2 answers · asked by xillusonx08 1

Neurotransmitters of the Autonomic Nervous System
Parasympathetic postganglionic axons secrete acetylcholine into synapses. Acetylcholine is rapidly decomposed by an enzyme in synapses. Most sympathetic postganglionic axons secrete norepinephrine (noradrenaline) into synapses. Most of the norepinephrine released by neurons is reabsorbed into nerve endings by active transport. Norepinephrine reabsorption may take a few seconds during which time some molecules may enter the blood and remain active until they diffuse into tissues containing decomposing enzymes.

Based on this information, which prediction can be made about the different actions of the two regulatory mechanisms?
A.Acetylcholine produces a more prolonged effect than norepinephrine.
B.Norepinephrine produces a more prolonged effect than acetylcholine.
C.Parasympathetic fibres transmit impulses faster than sympathetic fibres.
D.More energy is required to reabsorb acetylcholine molecules than to reabsorb norepinephrine.

2007-02-26 04:31:50 · 4 answers · asked by Anonymous

What determines the nature of logic? Does form {structure of the brain} decide its function or the function of the brain{nature of thought{ evolve the structure of the mind? Think carerfully and give a resonse. A logical response will help me to fomulate my own thinking, Many thanks.[ srry, but I am not repeating}

2007-02-26 04:26:47 · 20 answers · asked by polymath 1 3

2007-02-26 04:21:25 · 5 answers · asked by Anonymous

2007-02-26 04:17:28 · 15 answers · asked by chanky 1

2007-02-26 03:59:03 · 10 answers · asked by OLUSEGUN B 1

2007-02-26 03:58:57 · 2 answers · asked by dalton p 1

2007-02-26 03:56:39 · 2 answers · asked by dalton p 1

A. A theory that predicts how allele frequencies change over time, based on the idea that when the forces that affect them are balanced, allele frequencies are stable.
B. A methodology of using complex genetic arrays from modern organisms that enables evolutionary biologists to evaluate the completeness of the fossil record.
C. A central principle of evolutionary genetics that provides an analytical tool to estimate the effects of unusual environmental forces on populations, such as cosmic rays and mass extinctions.
D. An obscure model of theoretical biology that previously seemed to have little relevance to real-life situations but given advances in modern genetics is gaining wider acceptance.
E. A theory to predict how phenotypes change over time as a result of natural selection

2007-02-26 03:53:41 · 4 answers · asked by bb761866 2

2007-02-26 03:19:06 · 3 answers · asked by WEHA 3

2007-02-26 03:18:37 · 4 answers · asked by WEHA 3

2007-02-26 03:18:19 · 3 answers · asked by larry b 1

2007-02-26 03:16:30 · 3 answers · asked by WEHA 3

2007-02-26 03:15:57 · 3 answers · asked by WEHA 3

Aseptic Techniques In Microbiology

2007-02-26 03:13:48 · 7 answers · asked by Izzan 1

2007-02-26 02:56:08 · 5 answers · asked by Anonymous

i just know that it is one of the methods of sterilization... would like to know more about it...........

2007-02-26 02:55:08 · 5 answers · asked by Anonymous

2007-02-26 02:16:59 · 6 answers · asked by naveen r 1

How long does it take for a cracker to go from one's mouth untill it reaches the cardiac sphinkter?
Also, how long would it take for water to go from one's mout untill the cardiac sphinkter?

Thanks

2007-02-26 02:14:45 · 2 answers · asked by alanfreefall 2

2007-02-26 01:46:47 · 5 answers · asked by janak b 1

2007-02-26 01:33:51 · 13 answers · asked by Clark Kent 1

Which one is the most promising field of biology currently according to u, and why? The fields r – 1 - Public health 2-Food and agriculture

2007-02-26 01:30:54 · 1 answers · asked by RaInFaLL 1

2007-02-26 01:30:23 · 3 answers · asked by Komodo 1

If I give blood and the recipient subsequently commits a crime where he/she is cut and leaves blood behind, would my DNA also be at the crime scene?

2007-02-26 01:09:37 · 2 answers · asked by Yeldawk 3

I just did a lab in Biology where we inserted the glowing gene from a jellyfish into bacteria. I was wondering if the offspring of the bacteria would have the ability to glow.
I thought the answer was yes because all transformations should be heritable, but I'm not sure.

2007-02-26 00:52:04 · 7 answers · asked by Nikita R 2

2007-02-26 00:34:36 · 4 answers · asked by Anonymous

root hairs take up water from the soil by osmosis. what would happen if so much fertiliser (made out of nitrogen) was put on the soil that the soil water becomes a strongest solution than a cell sap of the root hairs?

2007-02-26 00:30:21 · 4 answers · asked by angel_halleluya 1

a complete ring of bark cut from around the circumference of a tree trunk causes the tree to die. the xylem continuous to carry water and salts to the leaves, which can make all the substances needed by the tree. so why does the tree die?

2007-02-26 00:28:40 · 3 answers · asked by angel_halleluya 1

2007-02-26 00:28:07 · 6 answers · asked by srmohamed r 1

describe the pathway followed by water molecule from the time it enters a plant root to the time it escapes into the atmosphere from a leaf.
need ur help asap! thanks a bunch!! :D

2007-02-26 00:25:16 · 2 answers · asked by angel_halleluya 1