Question

write some defects of nervous system​

Answer 1

Answer:

Disorders of the nervous system

Structural disorders, such as brain or spinal cord injury, Bell's palsy, cervical spondylosis, carpal tunnel syndrome, brain or spinal cord tumors, peripheral neuropathy, and Guillain-Barré syndrome. Functional disorders, such as headache, epilepsy, dizziness, and neuralgia.

Answer 2

Defects of Nervous system

Dyslexia :

$\bigstar$ Inability of a person to comprehend written language.

Ataxia :

$\bigstar$ Lack of muscle coordination due to damage of cerebellum.

Aphasia :

$\bigstar$ Inability to coordinate the understanding of speech and producing sound, due to defect of Wernicke's area.

Schizophrenia :

$\bigstar$ Caused by excess secretion of dopamine; characterised by incoherent speech, broken ideas, abnormal sequence of thoughts, often withdrawn, abnormal posture, intense fear, unreal feelings etc.

Alzheimer's disease (AD) :

$\bigstar$ 11% of the population over age 45, suffer from this neurological disorder.

$\bigstar$ It is caused due to hyposecretion of acetylcholine. It has no cure and the effects are devastating.

$\bigstar$ Initially AD victims have trouble in remembering recent events. Later they forget; repeat questionband change mood violently. They lose ability to read, write, talk or walk. Consequently the disease ends in dementia.

Parkinson's disease (PD) :

$\bigstar$ Is a progressive disorder of the CNS. It affects persons of 60 years, although the cause is unknown

$\bigstar$ In Parkinsonism, there is degeneration of dopamine-producing neurons in the substantia nigra and basal ganglia.

$\bigstar$ The resulting imbalance of neurotransmitter activity - too little dopamine and too much of acetylcholine - is thought to be the cause.

$\bigstar$ PD patients show involuntary skeletal muscle contractions called tremors. Parkinson's disease is also called Paralysis agitans.