Write an essay on the following topic. Compare arteries‚ veins and capillaries in terms of their features and functions. (12 marks) ## Content (maximum 9 marks) |Contents |Differences |Marks | |Features |Arteries have thicker wall to withstand the high blood pressure | | | |Veins have thinner wall.
Premium Blood
Investigating arteries and veins Aim: How far the artery and vein can stretch when different masses are hanged from them. Hypothesis: I predict that the heavier the mass the more likely it is to stretch the artery and vein further‚ eventually causing it to break apart. In addition the vein will stretch further than the artery when given the same mass. This is because arteries are much larger‚ muscular and more elastic than the veins‚ as they carry high pressure blood. Veins do not transport
Premium Blood Heart Vein
Investigating arteries and veins Methodology 1. Suspend a ring of artery from a hook on a clamp stand. 2. Use a metre rule to record the length of the ring once the mass carrier has been attached to the free end of the ring. 3. Attach a 10 g mass and record the length of the ring after the mass is added. 4. Remove the mass and record the length of the ring. 5. Repeat steps 2 and 3 using 20‚ 30‚ 40 and 50 g masses. Record the length with and without the masses each time. When comparing
Premium Blood vessel Blood Artery
to all the arteries. Brachiocephalic artery: The brachiocephalic artery carries oxygenated blood away from the heart. It supplies the brain‚ right arm‚ and neck with blood. Common carotid artery: The common carotid artery supplies oxygenated blood to the front of the brain as well as the head‚ neck‚ face‚ and spinal cord. Subclavian artery: The subclavian artery carries blood away from the heart and supplies oxygenated blood to the arms. Left pulmonary vein: The left pulmonary vein carries oxygenated
Premium Heart Blood
How is the structure of cells related to their function? Cell structures come in various shapes and sizes dependent on their location within an organism and what life sustaining process it carries out. These can range from the globular protein of a red blood cell‚ designed to carry four oxygen molecules at a time to the tail like flagellum of a bacteria designed for mobility and penetration of organs within a body. There are two main types of cells‚ eukaryotic cells which are generally plant
Premium Bacteria Eukaryote DNA
Plant Structure and Function Plant Body The unique organization of tissues in flowering plants is part of the reason why they are the dominant group of the plant kingdom. Monocots and Dicots Meristems Meristems – region of undifferentiated cells that can divide rapidly. Apical meristems – shoots and tip of roots (primary growth) Lateral meristems – thickening of the cambium (secondary growth) Plant Tissues Plant Tissues Xylem – conducts water and mineral ions; fluids can
Premium Plant stem Plant anatomy Plant
How the structure of proteins are related to their functions Rachel Morris The basic building blocks of proteins are amino acids‚ the biuret reaction tests for protein. A solution of sodium hydroxide is added to a sample then a few drops of copper sulphate solution‚ if positive – the solution will turn mauve. There are 20 different amino acids and they can be joined in any order. Therefore there can be many different functions. A protein consists of one or more polypeptide chains (a polypeptide
Premium Protein DNA Gene
“Varicose veins are gnarled‚ enlarged veins. Any vein become varicose‚ but the veins most commonly affected are those in your legs and feet. That’s because standing and walking upright increases the pressure in the veins of your lower body” (Mayo Clinic‚ 2011). “Varicose veins are the result of damaged or improperly working valves in the veins‚ which cause blood to back up and make the vein swell” (Cardio Smart‚ 2012). “Varicose veins are enlarged veins that can be blue‚ red‚ or flesh colored.
Premium Varicose veins Vein
Long Chan Topic: How are cockroaches adapted to survive? Cockroaches are more powerful insects‚ which live in a wide range of environment almost around the world‚ form the east to west and form the north to south‚ and human can see them in different districts around the world. The Cockroaches have about 30 species out of 4500 total are associated with human habitats and about four species are well known as pests. However‚ why they can succeed in the world? Follow that I will do some researches
Premium Reproduction Insect Cockroach
There are several good reasons to consider having your varicose veins removed. The most popular reason is appearance. Unless your legs and ankles are covered with clothing all of the time‚ your varicose veins will show. If they are severe‚ you may feel self-conscious and conceal your legs. This is the number one reason people want to remove their varicose veins. Varicose veins develop because the veins become weak and do not function properly to push the blood up the legs‚ against gravity back to
Premium Blood Heart Myocardial infarction