The parasympathetic division of the autonomic nervous system utilizes <u>acetylcholine</u> as a postganglionic neurotransmitter.
Explanation:
The parasympathetic nervous system consists of both preganglionic (soma in the brain cell/sacral spinal cord) and postganglionic neurons (soma in the ganglion near target organ).
These neurons utilize acetylcholine as the neurotransmitter to transmit the electric nerve signals and produce parasympathetic responses like lacrimation, salivation, sexual arousal, urination and defection at the respective target organs.
Acetylcholine (Ach) can activate the receptors – muscuranic and nicotinic chloinergic receptors.
Pathway of neurotransmission: upon stimulation, ACh released by the preganglionic neuron acts on nicotinic receptors in the postganglionic neurons. Then the ACh released by the postganglionic neuron acts on the muscuranic receptors at the target organ.
Answer:
Understanding the carbon cycle and how it behaves requires that we think of it as a complex dynamic system with components of the system interacting with each other in often unpredictable and emergent ways. A change in one part of a complex system can often cause a myriad of changes in other parts of the system. The Amazon forest ecosystem is a good example of a complex ecosystem currently undergoing changes.
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Answer:
It will eventually become less bright and cooler.
Explanation:
Astronomers estimate that the Sun's luminosity will increase by about 6% every billion years. This increase might seem slight, but it will render Earth inhospitable to life in about 1.1 billion years. The planet will be too hot to support life.
The Sun is a weakly variable star, and its actual luminosity therefore fluctuates. The major fluctuation is the eleven-year solar cycle (sunspot cycle) that causes a quasi-periodic variation of about ±0.1%. Other variations over the last 200–300 years are thought to be much smaller than this.
Answer
polydactylism
These kitties are born with an abnormal, dominant genetic mutation called polydactylism. While the polydactyl cat's appearance is quite unique, the polydactyl gene is somewhat common. Normally kittens are born with five toes on their front paws and four in the back.