Parkinson's disease (characterized by tremors and progressive rigidity of limbs) is caused by degeneration of brain neurons that are involved in movement control and make use of neurotransmitter
acetylcholine
norepinephrine
dopamine
GABA
C.
dopamine
A dopamine deficiency is due to low level of dopamine in the body. It leads to a problem with the receptors in the brain and develops into Parkinson's disease or depression.
Acetylcholine is a major neurotransmitter responsible for memory and learning. It can lead to diseases such as dementia and Alzheimer's.
Norepinephrine promotes arousal and alertness. Increased levels of norepinephrine leads to excessive activity of sympathetic nervous system, and it can further lead to obesity, metabolic syndrome and high blood pressure.
GABA or Gamma- Amino Butyric Acid deficiency can lead to depression, anxiety, insomnia etc.
Secretin and cholecystokinin are digestive hormones. They are secreted in
oesophagus
ileum
duodenum
pyloric stomach
In contrast to annelids the platyhelminthes show
radial symmetry
presence of pseudocoel
bilateral symmetry
absence of body cavity
An acromian process is characteristically found in the
pelvic girdle of mammals
skull of frog
pectoral girdle of mammals
sperm of mammals
Protein synthesis in an animal cell occurs
only on the ribosomes present in cytosol
on ribosomes present in cytoplasm as well as in mitochondria
only on ribosomes attached to the nuclear envelope and endoplasmic reticulum
on ribosomes present in the nucleolus as well as in cytoplasm
Which of the following pairs is correctly matched?
Cartilaginous joint - Skull bones
Hinge joint - Between vertebrae
Fibrous joint - Between phalanges
Gliding joint - Between zygapophyses of the successive vertebrae
Epithelial cells ofthe intestine involved in food absorption have on their surface
pinocytic vesicles
phagocytic vesicles
zymogen granules
micro-villi
Haemophilia is more commonly seen in human males than in human females because
this disease is due to an X- linked dominant mutation
a greater proportion of girls die in infancy
this disease is due to an X- linked recessive mutation
this disease is due to a Y- linked recessive mutation
The ability of the venus flytrap to capture insects is due to
chemical stimulation by the prey
a passive process requiring no special ability on the part of the plant
specialized "muscle-like" cells
rapid turgor pressure changes
One of the examples of the action of the autonomous nervous system is
knee-jerk response
pupillary reflex
swallowing of food
peristalsis of the intestines
