Zoology Assignment Help >> Blood Circulation System, Blood Vessels, Structure of a Blood Vessels
BLOOD CIRCULATION SYSTEM
(1) Open type of blood circulatory system: The circulating fluid (known as haemolymph or
perilymph) is not only present in the vessels but also present in the blood
spaces or lacunae or sinuses e.g. some arthropods, molluscs and annelids. blood remains(2) Close type of blood circulatory system: It is present in most of the annelids and all
The blood remains confined in the blood vessels. of the body bDifference between- artery and vein:
|Carry blood from heart to tissues.Pressure of blood is high and flows forcibly.||Comparatively low pressure and Constant speed. |
|Narrow lumen||Wide lumen|
|. Does not collapse while empty||Collapse while empty|
|Situated deeper in the body||Situated superficial in the body|
|No valve or valve like structure are found except some specialised arteries||Valves usually in pairs are present and are called watch pocket valve. They prevent back flow of blood.
|Colour is pink or bright red||Colour is deep red or violet|
|Carry oxygenated blood except pulmonary artery||Carry deoxygenated blood except pulmonary vein|
Structure of a blood vessel:
1. Tunica externa or Tunica adventitia: Of connective tissue, unsCarry deoxygenated
blood except pulmonary vein
Structure of a blood vessel
1. Tunica externa or Tunica adventitia: Of connective tissue, unstriped muscle fibre, elastic fibre etc.
2. Tunica media: Of circular unstriped muscle.
3. Tunica Interna or Tunica intina: Of endothelial tissue.
Live Zoology Experts: Blood Circulation System, Blood Vessels, Body Systems, Zoology Assignment Help
We at Expertsmind.com
offer blood circulation system in body system assignment help, defining blood vessels and structure of blood vessels homework assistance and coursework writing projects help with best online assistance from live online qualified
experts. We provide
coursework writing help with guaranteed 100% plagiarism free answers. Get solved
problems with quality of solutions at