BLOOD VESSELS
- Arteries and veins are the main blood vessels.
- Have thick walls to withstand the pressure of the blood and a small lumen
- Carry blood from heart to different organs.
- Do not have valves
- Carry oxygenated blood to the whole body except pulmonary artery.
- Situated deeper in the tissues
Veins:
- Have thinner walls and a large lumen.
- Carry blood from organs towards the heart.
- Have valves to prevent the back flow of blood.
- Carry deoxygenated blood to the lungs except pulmonary vein.
- Situated superficially.
Capillaries: Have extremely thin walled and very narrow lumen. They do not have valves Blood flows with low pressure. Allow exchange of gases food materials and waste. Capillaries join together to form venules then they join to form veins.
Lymphatic system
Lymphatic system is an open circulatory system. It consists of lymphatic capillaries Lymphatic vessels, lymph nodes and lymphatic organs. Lymph flows in one direction only i.e. from tissue to heart.
Capillaries have very fine pores through which blood plasma filters out and starts flowing into the inter cellular spaces. This fluid is called extracellular fluid. A part of this fluid enters into the lymph capillaries. The fluid inside the lymph capillaries is called lymph. Lymph is yellow fluid which contains blood plasma minus blood proteins.
Lymph enters into lymph capillaries which join together to form large lymph vessels The lymph vessels finally drains lymph into large veins.
Functions of lymph
- It takes up excess fluid that has diffused out from the blood capillaries and puts it into blood.
- It has lymphocytes which fight against germs and bacteria and produce antibodies to fight against infections.
- It absorbs and carries digested fats from the intestine.
2 comments:
this is very nice ma'm
if u r doing some project on plants i can give u a very good coding of the background
Good day to all, am so happy sharing this great testimony on here, I was diagnose of Stage IV colon cancer.i was checking for solution in the internet then miraculously i came Across Dr God hands the powerful herbalist that Cure Numerous Diseases such as-Thyroid Cancer,Uterine cancer,Fibroid,Angiopathy, Ataxia,Arthritis,Amyotrophic Lateral Sclerosis,Brain Tumor,Fibromyalgia,Fluoroquinolone ToxicityBladder cancer,Brain cancer,Hiv,Herpes,Esophageal cancer,Gallbladder cancer,Gestational trophoblastic disease,Head and neck cancer,Hodgkin lymphoma
Intestinal cancer,Kidney cancer,Hpv,Lung cancer,Melanoma,Mesothelioma,Multiple myeloma,Neuroendocrine tumors
Non-Hodgkin lymphoma,Oral cancer,Ovarian cancer,Sinus cancer,Hepatitis A,B/C,Skin cancer,Soft tissue sarcoma,Pancreatic Cancer,Spinal cancer,Stomach cancer,Vaginal cancer,Vulvar cancer,
Testicular cancer,Tach Diseases,Leukemia,Liver cancer,Throat cancer,
Syndrome Fibrodysplasia Ossificans ProgresS sclerosis,Alzheimer's disease,Chronic Diarrhea,Copd,Parkinson,Als,Adrenocortical carcinoma Infectious mononucleosis. ,I contacted him based on the testimonies I?m seeing about him on the internet, I was cured too by him, kindly contact him today through his email he can help you. doctorgodhands@gmail.com and his herbal medicines will set you free from any human diseases,all thank to you Dr god hands for your kindly help in my life his Mobile number Whatsapp.+2349057214220.
Post a Comment