AC-HPAT Biology 2023 Guide with complete solution
Pancreas and Type 1 diabetes
The pancreas is the organ that produces insulin, and it plays a major role in regulating blood glucose levels. Type 1 diabetes occurs when the pancreas does not make enough or any insulin.
How does insulin work in d...
AC-HPAT Biology 2023 Guide with complete solution
Pancreas and Type 1 diabetes
The pancreas is the organ that produces insulin, and it plays a major role in regulating
blood glucose levels. Type 1 diabetes occurs when the pancreas does not make
enough or any insulin.
How does insulin work in diabetes?
Insulin pumps are small, computerized devices that mimic the way the human pancreas
works by delivering small doses of short acting insulin continuously (basal rate). The
device also is used to deliver variable amounts of insulin when a meal is eaten (bolus)
chemotherapy
Chemotherapy is a drug treatment that uses powerful chemicals to kill fast-growing cells
in your body. Chemotherapy is most often used to treat cancer, since cancer cells grow
and multiply much more quickly than most cells in the body. It targets cells that grow
and divide quickly, as cancer cells do. Unlike radiation or surgery, which target specific
areas, chemo can work throughout your body. But it can also affect some fast-growing
healthy cells, like those of the skin, hair, intestines, and bone marrow.
How can stem cells be used in the treatment of leukemia? And how effective is it?
Stem cell transplant replaces the leukemia cells in your bone marrow with new ones
that make blood. Your doctor can get the new stem cells from your own body or from a
donor. Stem cell transplantation is effective against leukemia. In many cases, however,
the transferred immune cells of the donor also attack the recipients' healthy tissue—
often with fatal consequences. ... Stem cell therapy offers people suffering from
leukemia or bone-marrow cancer the chance of full recovery.
Why is laser technology more effective than conventional surgery in removing
cancerous tumours?
Lasers are more precise than standard surgical tools (scalpels), so they do less damage
to normal tissues. As a result, patients usually have less pain, bleeding, swelling, and
scarring. With laser therapy, operations are usually shorter.
Urinary system
· The urinary system, also known as the renal system or urinary tract, consists of the
kidneys, ureters, bladder, and the urethra. The purpose of the urinary system is to
eliminate waste from the body, regulate blood volume and blood pressure, control levels
of electrolytes and metabolites, and regulate blood pH
Nanotechnology
Nanotechnology can provide rapid and sensitive detection of cancer-related molecules,
enabling scientists to detect molecular changes even when they occur only in a small
percentage of cells.
Mercury poisoning
The most common cause of mercury poisoning is from consuming too much methyl
mercury or organic mercury, which is linked to eating seafood. Small amounts of
mercury are present in everyday foods and products, which may not affect your health.
Too much mercury, however, can be poisonous. Mercury salts affect primarily the
gastrointestinal tract and the kidneys, and can cause severe kidney damage; however,
as they cannot cross the blood-brain barrier easily, these salts inflict little neurological
damage without continuous or heavy exposure.
, How can ultraviolet light from the sun affect the cells of the human eye?
UV rays may lead to macular degeneration, a leading cause of vision loss for older
Americans. UV rays, especially UV-B rays, may also cause some kinds of cataracts. A
cataract is a clouding of the eye's natural lens, the part of the eye that focuses the light
we see.
Macromolecules
Macromolecules are large molecules composed of thousands of covalently connected
atoms. Carbohydrates, lipids, proteins, and nucleic acids are all macromolecules.
Macromolecules are formed by many monomers linking together, forming a polymer.
passive transport
Passive transport is a movement of ions and other atomic or molecular substances
across cell membranes without need of energy input. Unlike active transport, it does not
require an input of cellular energy because it is instead driven by the tendency of the
system to grow in entropy.
active transport
active transport is the movement of molecules across a membrane from a region of
lower concentration to a region of higher concentration—against the concentration
gradient. Active transport requires cellular energy to achieve this movement.
catalyst
Catalyst: a substance that increases the rate of a chemical reaction without itself
undergoing any permanent chemical change.
fluid mosaic model
describes the structure of the plasma membrane as a mosaic of components —
including phospholipids, cholesterol, proteins, and carbohydrates—that gives the
membrane a fluid character. The proportions of proteins, lipids, and carbohydrates in
the plasma membrane vary with cell type
Effect of lead on nerve cells
Lead poisoning can cause peripheral nerve damage: this can cause muscle weakness
and problems with the sense of touch. When researchers examine these damaged
nerves, they find that the myelin insulation is often gone, and the axons are destroyed.
These changes prevent nerves from transmitting messages properly.
the effect of electromagnetic radiation on brain
Reported symptoms include headaches, anxiety, suicide and depression, nausea,
fatigue and loss of libido. To date, scientific evidence does not support a link between
these symptoms and exposure to electromagnetic fields.
Carbohydrates function
Carbohydrates are the most abundant biomolecule on Earth. Living organisms use
carbohydrates as accessible energy to fuel cellular reactions and for structural support
inside cell walls. Cells attach carbohydrate molecules to proteins and lipids, modifying
structures to enhance functionality.
Proteins function
Proteins fold up into specific shapes according to the sequence of amino acids in the
polymer, and the protein function is directly related to the resulting 3D structure.
Proteins may also interact with each other or other macromolecules in the body to
create complex assemblies.
Enzymes function
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