Transport in Humans and Animals

Question 1:State two differences between the circulatory systems of fish and humans. Answer:Fishes have a single circulatory system whereas humans have a double circulatory system. Fishes have an atrium and a ventricle while humans have two atria and two ventricles.  Question 2:Explain why the blood circulatory system of amphibians is considered as a closed and … Read more

Question 1:Figure below shows part of the circulatory system and the lymphatic system in the human body. (a)(i) What is fluid V? [1 mark](ii) What happens to the components of fluid V when it passes through the lymph node? [1 mark](b)(i) Fluid V originates from the blood.Describe how fluid V is formed from the blood. [2 marks](ii) … Read more

Question 1:(a)(i) Diagram below shows an electron micrograph of cellular components of human blood. Based on Diagram I, explain how platelets help to stop bleeding when a wound occurs. [4 marks](ii) A blood test shows that a man’s erythrocytes count is below normal.Explain the possible consequences of this condition on his health.What type of food … Read more

The Formation of the Interstitial Fluid and Lymph   1. The blood from the arteries flows at a high pressure into the blood capillaries.   2. The high hydrostatic pressure in the capillaries forces the blood plasma to  leak out through the capillary walls into the space between the body cells.   3. The fluids that … Read more

The lymphatic system is part of the circulatory system, comprising a network of conduits called lymphatic vessels that carry a clear fluid called lymph directionally towards the heart. The lymphatic system consist of lymophatic vessels lymphatic capillaries lymph nodes spleen thymus

Haemophilia Haemophilia is a group of hereditary genetic disorders that impair the body’s ability to control blood clotting or coagulation. As a result, minor injuries and internal bleeding can results in death owing to excessive loss of blood. Thrombosis Thrombosis is the formation of a blood clot (thrombus) inside a blood vessel, obstructing the flow of … Read more