Hormones glucagon and insulin are produced in the alpha and beta cells respectively in the Islet of Langerhan in the pancreas. They are involved in the negative feedback system of blood glucose regulation in homeostasis.
GLUCAGON: when there is a low blood glucose concentration, the pancreas detect this and alpha cells produce and release glucagon. Glucagon causes the cells of the body to absorb less glucose from the blood. It also inhibits the process of converting glucose into glycogen (glycogenesis) and cause gluconeogenesis (process of converting amino acids/proteins and lipids/fats into glucose) and glycogenolysis (conversion of glycogen to glucose). Finally, glucagon decreases the rate of respiration so less glucose is required.
INSULIN: when blood glucose is high, insulin is released. Insulin binds with cell surface receptors of cells and activates the enzymes attached to the receptor. The enzymes cause a conformational change in the structural proteins that surround glucose transport protein containing vesicles, causing them to move out of the way so the vesicles migrate up to the cell membrane and glucose transport proteins can fuse with it. Thus, more glucose can be taken in by cells. Insulin also cause glycogenesis (converting glucose into glycogen) and inhibits gluconeogenesis and glycogenolysis.
Basically insulin decreases blood glucose concentration (eg. after eating) and glucagon increases it (eg. skipping breakfast in the morning)
Answer:
Biologists can grow specific plants to detoxify an area contaminated with heavy-metal pollution using the method of <u><em> Bioremediation. </em></u>
To rid an area of mosquitoes, biologists introduced a species of fish into bodies of water that feed on the mosquito larvae. This method is an example of <em>Biological Augmentation.</em>
Explanation:
Bioremediation can be described as a process which uses plants or microorganisms to detoxify contaminants that are present in an area. The enzymes of a plant or animal tend to break down the contaminants and hence, we can make an area rid of contaminants in this way.
Biological augmentation can be described as a method by which organisms such as bacteria are introduced in an area to get rid of wastes.
Answer:
This is false.
Explanation:
Stars are made of very hot gas. This gas is mostly hydrogen and helium, which are the two lightest elements. ... Most stars have small amounts of heavier elements like carbon, nitrogen, oxygen and iron, which were created by stars that existed before them.
I was sitting in my room, my eyes glued to the flashing screen, the palm of my hands slick with sweat as I struggled to hold onto the controller, the smooth surface slipping every second or so. I could barely hear anything, but the blaring of the sound effects that blasted through my room, shutting out any sound, including the knock on my door from my mother. I started, dropping the controller, my eyes wide. I snapped "What!" at my mother, her face contorting into pinched irritation. "Dinner is ready." She said, turning away to head back down the stairs. My eyes shifted to the open doorway, the nostrils of my nose flaring as I took in the scent of food. I could smell spices, and the humid stench of steam. My stomach growled and I quickly shot up from the floor and thundered down the stairs, leaping into the kitchen to find the source of the heavenly smells that wafted in my direction. I spotted turkey, garnished with lemon and green herbs, and sitting beside it, a large bowl of something off-white. It looked like mashed potatoes. I hastily took a seat and set my elbows upon the wooden surface of the table, my mother scolding me over her shoulder as she divided place settings. "Elbows off, please." She piped, pulling out her own chair with an ear splintering squeal that grated my nerves, causing my teeth to grind together. My mother passed a plate of green beans towards me, and I quickly scooped them onto my own plate, then going for the turkey, the mashed potatoes added last. With no time for prayer, I dug in, the tinges of my fork scraping against the plates clay surface as I scooped a fork full of beans up, and shoved it into my mouth. It tasted bland, with the barest hint of salt. I swallowed, cringing as it went down and took a bite of the mashed potatoes. Of course it was delicious. They were light, buttered perfectly. I gave a small sound of appreciation and went for the turkey last. I stabbed a piece of meat and popped it into my mouth, the texture odd. Hard to describe really. It was tough, but also soft enough to bite into, and with lemon added into it, it was tangy, making my mouth salivate. My mom smiled at the expression my face, nearly laughing. I made a face at her and swallowed, going in for another bite.
Answer:
B. Asexual reproduction involves one parent, and sexual reproduction involves two.
