Answer:
B. II only. Brain damage resulting from the bioaccumulation of heavy metals.
Explanation:
The mercury concentrated mine tailings dumped in the nearby water bodies undergo methylation process and is converted to methyl mercury by bacteria in the aquatic environment. The aquatic plants absorb this and when fishes eat these plants, they also get contaminated with mercury. This leads to bioaccumulation of mercury in the aquatic environment.
Mercury is a neurotoxin and contamination in humans by consuming mercury-contaminated fishes leads to neurological damage like memory impairment, decreased concentration and IQ, decreased motor skills or dexterity, tremors, movement disorders, depression, anxiety, or psychosis. Chronic mercury contamination can lead to neurological disorders like Alzheimer’s, autism, Parkinson’s etc.
Answer:
The correct answer is A.
Explanation:
Cholecystokinin is a hormone produced in the duodenum by enteroendocrine cells. Its main function is to stimulate the gastrointestinal system to digest fat and protein.
To accomplish that, it stimulates the <em>pancreas</em> to release digestive enzymes and the <em>gallbladder</em> to release bile.
Answer:
a. True
Explanation:
Endothelial cells
These cells are found in all the parts of the circulatory system , these are about a cell thick , and composes a wall known as the edothelium , which lines all the blood vessels , i.e. , the arterioles , veins , capillaries , arteries , venules .
Beneath the endothelial cells , there is a layer of smooth muscle cells .
