The electrons in the outermost shell of the covalent compounds are shared by nearby atoms. As there are no free electrons for conducting electricity, the covalent compounds are perfect insulators at absolute zero. As the temperature increases, some electrons move from valence band to conduction band. This gives rise to conductivity. But as the numbers of charge carriers are very low, covalent compounds are poor conductors. On the other hand metals are good conductors cause of their bonding. Metallic bonding consists of a sea of electrons rather than discreet bonds. The free electrons are able to move freely. Since electricity and heat need electrons to move, the bonding promotes conductivity.
The parasympathetic nervous system responds when the body is relaxed and at rest while sympathetic nervous system is responsible for response to emergency situation.
Explanation:
- The sympathetic nervous system is called fight or flight division while the parasympathetic nervous system is the rest and digest division.
- The pre-ganglionic neurons of sympathetic nervous system arises from lumbar and thoracic regions of spinal chord while the preganglionic neurons of parasympathetic nervous system arises from the brain and sacral region of the spinal cord.
- The sympathetic nervous system decreases the activity of digestive system while the parasympathetic nervous system increases the activity of digestive system.
- Sympathetic nervous system dilates bronchioles while parasympathetic nervous system constricts bronchioles.
- Sympathetic nervous system increases blood pressure while parasympathetic nervous system usually do not effect blood pressure.
- Sympathetic nervous system increases heart rate while parasympathetic nervous system decreases heart rate.
Answer:
false
Explanation:
slime molds are soil dwelling amoeba
I think the answer would be your skin.
Answer:
Generalized anxiety disorder
Explanation:
An individual is said to be suffering from generalized anxiety disorder (GAD) when he/she is excessively and continually worried about several things at the same time. This worry could be as a result of concern about health, work, money , family and other pressing issues. People with generalized anxiety disorder usually have difficulty in controlling their worries.
Generalized anxiety disorder is not limited to any age. Other symptoms are sleeplessness, muscle tension, obsessive-compulsive disorder, restlessness etc. It is usually treated with counselling or drugs like antidepressants.
