Answer:
The incorrect statement is - Energy is created and destroyed when it changes forms.
Explanation:
The conduction or transfer of energy required close contact between particles of the molecules therefore conduction does not take place in gases as they are not in direct contact with their molecules. Radiation involves waves that may generate due to the electromagnetic field.
Convection describes the transfer of energy by movement of dense fluid or fuel to warm the colder are it explains how a heater warms up the inside of a car. The third option is incorrect as energy can not be formed or destroyed in any circumstances or system it will just change it form.
Answer:
True
Explanation:
Periaqueductal gray matter is found in the middle portion of brain. When this grey matter is stimulated it activates neurons that releases enkephalin. Enkephalin further direct the stimulation to the raphe nuclei with in the brain stem that releases serotonin. In this process, the ascending and descending axons are released from
a) subcortical nuclei
b) spinal trigeminal nuclei
c) the spinal cord
Hence, the given statement is true
The right answer is C.
During inflammation, under the influence of chemical mediators, endothelial cells (forming the blood vessels) become activated. This leads to local arteriolar vasodilation then capillary2 which causes:
** an increase in blood supply
** a decrease in the speed of blood flow
This local swelling of the blood vessels causes redness and the sensation of heat. It aims to increase the flow of blood to evacuate dead cells and toxins (detox) and provide the elements necessary for healing, including white blood cells to fight against foreign bodies.
Capillaries<span> are </span>small<span>, thin </span>blood vessels<span> that connect the </span>arteries<span> and the veins. Their thin walls allow oxygen, nutrients, carbon dioxide and waste products to pass to and from the tissue cells.</span>
