Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Primitive Nervous System - Nerve Net
A nervous system creates its appearance for the first time in the phylogeny among Cnidaria. In this group the nerve cells make an irregular nerve net or plexus. In hydras we have a simple condition. The nerve net is build up of bipolar or tri-polar and rarely multi-polar neurons. The sensory nerve cells are distributed in between the epithelial cells; they send their nerve fibers to the sub-epithelial nerve plexus. The plexus is located beneath the epidermis. In hydroid polyps the plexus is concentrated around the mouth, suggesting the beginning of a centralised nervous system. Several cnidarians have more complicated nerve nets; for example they may have as well as gastro dermal nerve net within the gastrodermis in addition to the epidermal nerve net like in sea anemones. A double nerve net in the same body layer is also common in some coelenterates. There is quite a lot of autonomy, in that, isolated parts of the animal behave as if parts of the body. There is no central controlling mechanism apparently because there is no distinct central nervous system. It is as well poor in specific responses to particular stimuli. Transmission is un-polarised, in that impulse can be transmitted in either direction along the synapse not like in higher animals. This occurs because both terminals secrete transmitter substance. So the nerve plexus in this group shows diffuse, un-polarized transmission, autonomy of parts and scarcity of reflexes.
Which of the following sugars does NOT contains an O-glycosidic bond? Select one: a. amilose b. amylopectin c. glycogen d. cellulose
Q. Dietary management during atherosclerosis? Dietary management and the nutrient requirements during atherosclerosis remain the same as for the management of dyslipidemia. Hen
Phototherapy Unit Principle Photoisomerisation and photo-oxidation changes indirect bilirubin into water soluble substance. Operational Instruction Adjust
Q. Predominant feature of steatorrhoea? A predominant feature is delayed and defective absorption of fat, which results in bulky stools containing large quantities of fat (know
Define Precautions for Determination of Haemoglobin Content in Blood 1. Potassium cyanide is highly toxic and hence drabkin's solution should not be pippeted by mouth. 2. Dr
Q. Show the Pre-Diabetes Conditions? Pre-diabetes is a condition which may occur between normal and diabetes stages. It is important for you to know about this group of people,
WHY BLOOD IS CALLED FLUID CONNECTIVE TISSUE
Explain Post Myocardial Infarction Surgery Indications ? Indications for Surgery : Presence of ventricular septal rupture is an indication for surgery. Timing of surgery is
Population Density - Biological Stress You are aware of what might follow an uncontrolled growth of human population. There will be competition for common consumables and for
Define Popularity of Chromatography - Basic Separation Technique? Chromatography is popular because: (a) minute quantities can be analysed qualitatively and quantitatively,
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd