Circulation

Kiran
Flashcards by Kiran, updated more than 1 year ago
Kiran
Created by Kiran over 7 years ago
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Flashcards on Circulation, created by Kiran on 10/25/2013.

Resource summary

Question Answer
Name the main types of Blood Vessel Veins, Artery, Capillaries
Where do Veins carry blood ? Collects de-oxygenated blood from the capillaries and return the blood into the heart
How are Veins adapted for their function ? They have thin walls and blood is at low pressure
Why do the Veins contain valves ? To prevent the backflow of blood
Where do Arteries carry blood ? Takes oxygenated blood away from the heart to the body organs and tissues
How are Arteries adapted to their function ? Cell wall is thick and muscular so it can withstand high pressure of the blood being pumped directly from the heart
Where do Capillaries carry blood ? Form a network to take blood through the organs and tissues
How are Capillaries adapted to their function ? One cell thick which allows diffusion to happen quicker
Is the blood from the Capillaries under any pressure ? Yes, water and other substances are squeezed out into the surrounding inter cellular spaces
What is Plasma ? Is the liquid part of the blood - water (solvent)
What does Plasma transport ? Carbon dioxide, Nutrients such as glucose ammino acids,Urea(waste substance) and Hormones
What do Red Blood Cells do ? Absorb oxygen in the lungs and releases it into the rest of the body
What do Red Blood Cells contain ? Haemoglobin. Haemoglobin + oxygen --> oxyhaemoglobin
How are Red Blood Cells adapted to their function ? No nucleus. It has a biconcave shape (has an indentation) which means it has a larger surface area
What is an symptom of Anemia ? Lack of iron means less Haemoglobin this means less oxygen therefore less respiration therefore less energy
Name the two types of White Blood Cells Phagocytes Lymphocytes
Describe how an Lymphocyte destroys a bacterium Produce antibodies which stick to the antigens on the bacterium.
What does an Lymphocyte cell look like ? They have a large nucleus where after the antibodies are produced,they stick to the antigens
What is an Antibody ? Antibodies are soluble proteins that pass into the plasma
What are Memory cells ? Sometimes lymphocytes develop into memory cells. Memory cells make us immune to a disease so if the same pathogen re infects the memory cells start to reproduce anitbodies to fight of the infection off quicker
Describe how a Phagocyte destroys bacteria They change their shape by expanding their cytoplasm called Pseudopodia. The Pseuodpodia surround and engulf the microorganism which then releases enzymes to break the organism down
What does a Phagocyte cell look like ? They have a cell membrane, cytoplasm and a nucleus. It has an abnormal looking nucleus
What are Platelets ? They release an enzyme called Fibrin to make blood lots when we cut ourselves
Suggest the consequence of having too few platelets in the blood Could lose a lot of blood which can lead to bleeding to death and more bacteria infection can get in
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