NERVOUS SYSTEM :
Function of nervous system is perception of sense & analysis of sense, reaction according to a sense & control and coordination of various parts of body.
It is divided into 3 parts
(a) Central Nervous system : Central nervous system is made up of brain & spinal cord. It is involved in analysis of sense.
(b) Peripheral Nervous System : It is made up of cranial nerves and spinal nerves. 10 pairs of cranial nerves & 10 pairs of spinal nerves are present in frog.
– (In Ranatigrina, 9 pairs spinal nerves are present) 12 pairs cranial nerve & 31 pairs spinal nerves are present in human.
– 12 pairs cranial nerves & 33 pairs spinal nerves are present in rat.
(c) Autonomous Nervous System : This controls the autonomous parts (automatic) of the body.
This system control the autonomic parts of the body like heart, lungs & intestine. Two type of nerves are present in it.
(1) Sympathetic Nerve : It increase the rate of autonomous organs.
(2) Parasympathetic nerve : It decrease the rate of autonomous organs.
Excretory system : One pair of kidney are present in it. Each kidney is made up of 2000 uriniferous tubules or nephrons. Kidney form urine which is stored in urinary bladder & excreted through cloacal aperture. The main excretory product in frog is urea, so it is a ureotelic animal.
SPECIAL POINTS :
1. Sexual dimorphism is present in frog. Nuptial pad & vocal sac are present in male frog only.
2. 10 vertebrae are present in frog.
3. Frog has different types of sense organs, namely organs of touch(sensory papillae), taste (taste buds), smell (nasal epithelium), vision (eyes) and hearing (tympanum with internal ears).
ECONOMICAL IMPORTANCE OF FROG :
Frogs are beneficial for mankind because they eat insects and protect the crop. Frogs maintain ecological balance because these serve as an important link of food chain and food web in the ecosystem. In some countries the muscular legs of frog are used as food by man.
26 videos|287 docs|64 tests
|
1. What is the function of the excretory system in frogs? |
2. How does the nervous system of a frog work? |
3. What organs are involved in the excretory system of a frog? |
4. How does the excretory system of a frog differ from that of a human? |
5. How does the nervous system of a frog control its movements? |
|
Explore Courses for NEET exam
|