PL/EX/02 PL/EX/02 04. Answer all parts. i. The state of being resistant to injury, invading pathogens, and foreign subst

[answerhappygod]

Pl Ex 02 Pl Ex 02 04 Answer All Parts I The State Of Being Resistant To Injury Invading Pathogens And Foreign Subst 1 (72.51 KiB) Viewed 12 times

be quick and clear
PL/EX/02 PL/EX/02 04. Answer all parts. i. The state of being resistant to injury, invading pathogens, and foreign substances through defensive mechanisms in the body is known as immunity. a. Name the immune cell type that produces antibodies. (1 mark) b. What is the importance of memory B cells and memory T cells in immunity? (1mark) ii. The survival of an organism depends on its ability to detect and respond to changes in their internal and external environment. a. What is a reflex action? (2 marks) b. The Reflex Are is shown in Figure 5. Identify A and B and indicate a function of each. (4 marks) Type of Neuron A B B Touch imatel Pressure Nervous coordination e. Give two differences between nervous and endocrine coordination in humans. Function gangan i IL val L Figure 5. Receptor cells REV 00/00000000 d. Give two examples each of the specialized receptor cells within the skin that detect the following sensations. (4 marks) Endocrine coordination REV00/00.000000 (4 marks) End of question paper iii. Excretion is the physiological process of eliminating metabolic waste from the body. Kidneys are the major excretory structures found in vertebrates a. Name two excretory structures found in Invertebrates. Mention one animal under each structure. (4 marks) Excretory Structure Invertebrate (Animal) iv. Major nitrogenous excretory products of animals are Ammonia, Urea and Uric Acid that vary significantly in toxicity and the energy cost in producing them. a. What is the most toxic product out of the above three forms (Ammonia, Urea and Uric Acid)? (1 mark) (1 mark) b. What is the main nitrogenous excretory product in Mammals? c. Which one of the above three forms (Ammonia, Urea, Uric acid) are relatively nontoxic and insoluble in water? Give one example of an animal belonging to this group. (2 marks) d. Which excretory product requires the most energy in its production? (1 mark) (Total 25 Marks)