organisation Flashcards
define the term tissue
any of the distinct types of material of which animals or plants are made, consisting of specialized cells and their products.
how are the alveoli adapted for gas exchange
The alveoli are adapted to make gas exchange in lungs happen easily and efficiently. they give the lungs a really big surface area. they have moist, thin walls (just one cell thick) they have a lot of tiny blood vessels called capillaries.
what is an enzyme
a substance produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction.
Describe the lock and key model
The specific action of an enzyme with a single substrate can be explained using a Lock and Key analogy
What enzyme breaks down proteins
There are two enzymes in your saliva called amylase and lipase.
How would you test for a protein
Biuret solution.
What would a positive result be for the iodine test
A chemical test for starch is to add iodine solution (yellow/brown) and look for a colour change. In the presence of starch, iodine turns a blue/black colour. Benedict’s reagent will give a positive test result for glucose but not for starch.
How would you test for a lipid
The emulsion test is a method to determine the presence of lipids
What would a positive result be for the benedict’s test
A positive test with Benedict’s reagent is shown by a color change from clear blue to a brick-red precipitate.
Describe the path of a red blood cell in the left side of the heart
The deoxygenated red blood cell now makes its way to the vena cava within the heart, and is then pushed into the right atrium.There it picks up oxygen making the deoxygenated red blood cell now an oxygenated blood cell. The blood cell then makes it way back to the heart via the pulmonary vein into the left atrium.
Describe the structure of an artery
The wall of an artery consists of three layers.
Describe the structure of a vein
three main layers. … Veins are blood vessels that carry blood toward the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart.
Explain the functions of the 4 components of blood
It has four main components: plasma, red blood cells, white blood cells, and platelets. Blood has many different functions, including: transporting oxygen and nutrients to the lungs and tissues.
What is a coronary artery
an artery supplying blood to the heart
How can you reduce the risk of coronary heart disease
lowering your blood pressure and cholesterol levels
