Q.14 Explain the disorders of Nervous system. Disorders of nervous system can be categorized into two main types i.e. (i) Vascular Disorders Vascular disorders are due to any disturbance in the blood supply to nervous system e.g. paralysis. Paralysis Paralysis is the complete loss of function by one or more muscle groups. Patients may have …
Q.13 What do you mean by feedback Mechanism? Explain. Feedback Mechanism Endocrine glands do not secrete their hormones at a constant rate. The rate varies with the needs of the body. Like many other functions in body, the secretion of hormones is also regulated by feedback mechanisms. Definition: Feedback mechanism means the regulation of a process …
Q.13 What do you mean by feedback Mechanism? Explain. Read More »
Q.12 What is endocrine system. Describe important endocrine glands. Answer: Endocrine Glands Introduction Endocrine system regulates the activities such as growth, reproduction, maintenance of glucose concentration in blood, reabsorption of water in kidneys etc. Hormones Endocrine system uses chemicals to communicate with its effectors. These chemicals are known as hormones. A hormone is a specific messenger …
Q.12 What is endocrine system. Describe important endocrine glands. Read More »
Q.11 Explain the structure of human ear in detail. Describe its functioning in balancing of body. Answer: Ear Hearing is as important as vision. Our ear helps us in hearing and also to maintain the balance or equilibrium of our body. Structure of Ear Ear has three main parts i.e. (a) External ear (b) Middle Ear …
Q.10 What is the contribution of Muslim scientists in the discovery and cure of eye diseases? Answer: Ali ibn Isa (950-1012) was a famous Arab scientist. He wrote three books on ophthalmology (study of the diseases and surgery of eyes). He described 130 eye diseases and prescribed 143 drugs to treat these diseases. On : Ibn …
Q.9 Explain the disorders of Eye. Answer: Following are the disorders of eye. 1. Night Blindness Rods contain a pigment called rhodopsin. When light falls on rhodopsin, it breaks for generating a nerve impulse. In the absence of light, the breakdown products are again converted into rhodopsin. Body synthesizes rhodopsin from vitamin A and that …
Q.8 Describe structure and mechanism of function of human eye. Answer: Human Eye Location Our eyes are located in small portions of skull known as the orbits or eye sockets. External Structure of Eye (i) Eyelids Functions Eyelids wipe eyes and prevent dehydration. They spread tears on eyes which contain substances for fighting bacterial infections. (ii) …
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Q.7 Define reflex action. Explain it with an example Answer: REFLEX ACTION Definition Sometimes the involuntary response produced by the CNS is very quick. Such a response is called reflex action. Types of action When CNS sends impulses to muscles and glands, two types of actions or responses result. Voluntary Actions The higher centers of …
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Q.6 Explain Peripheral Nervous System (PNS) in detail. Answer: PERIPHERAL NERVOUS SYSTEM (PNS) Components of PNS: The PNS is composed of nerves and ganglia. Ganglia Ganglia are the clusters of neuron cell bodies outside the nervous system. Number of cranial and spinal nerves. Humans have 12 pairs of cranial nerves and 31 pairs of spinal …
Q.6 Explain Peripheral Nervous System (PNS) in detail. Read More »
Q.5 Explain Central Nervous System (C.N.S) in detail. Parts of CNS CNS consists of two parts: (i) Brain” (ii) Spinal cord (i) Brain Introduction In animals, all life activities are under the control of brain. The structure of brain is suitable to perform this function. ” Location Brain is situated inside a bony cranium i.e. …
Q.5 Explain Central Nervous System (C.N.S) in detail. Read More »