False Chemical cold packs should be stored in a refrigerator.
A chemical cold pack consists of a bag within a bag. The inner bag contains water. The outer bag typically contains urea or ammonium nitrate. When the inner bag is broken, the water mixes with the chemical in the outer bag, dissolving it. As the chemical dissolves, this is an endothermic reaction. As the reaction absorbs energy, the device cools down.
This cooling will occur independent of whether the cold pack is stored in the refrigerator or not.
Answer and Explanation:
During the body's metabolism, molecules are generated that are residues of chemical and methanbological reactions. These molecules need to be removed from the body and this process is done by the excretory system. Most of these molecules are wastewater and nitrogen compounds.
The kidneys are a very important point in this system, along with the urinary system. When blood, rich in oxygen, comes in contact with the kidneys, they are filtered by this organ. This is done through structures called the nephron which are the excretory unit of the kidneys. Within each nephron there is a collecting capsule where water and residual particles that are in the blood are captured, while the rest of the particles pass along with the blood and continue on their way to other regions of the body.
From inside the kidneys there is also a tube called the ureters, which captures the water and molecules captured by the nephron (which forms the urine) and takes them to the bladder, which directs the urine out of the body through the urethra.
C is the answer for this one
<span>Vitamins are classified as either
fat soluble (vitamins A, D, E and K) or water soluble (vitamins B and
C). This difference between the two groups is very important. It
determines how each vitamin acts within the body. Fat soluble vitamins,
once they have been stored in tissues in the body, tend to remain there.
This means that if a person takes in too much of a fat soluble vitamin,
over time they can have too much of that vitamin present in their body,
a potentially dangerous condition called hypervitaminosis (literally,
too much vitamin in the body). Water-soluble vitamins, including
vitamins C and B, are excreted much more quickly than fat-soluble
vitamins, and they need to be replaced more frequently.</span>
