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!
Excitation of Heart - Circulation
The heart has an inherent capacity to contract rhythmically without any external stimulus. Proof of this is obtained when we see that the heart in a developing chick embryo begins to beat even before any nerve has reached it and also heart muscle cells grown in culture contract rhythmically without any external stimulus. The electrical activity begins in a pacemaker region of the heart. Pacemaker cells are capable of spontaneous activity and may be either neurous as in many invertebrate hearts or muscle cells. If the heartbeat is initiated in a neuron, the pacemaker is called neurogenic pacemaker and if the heartbeat is initiated in muscle cell then the pacemaker is known as myogenic pacemaker.
Based on the type of pacemaker, hearts are classified as neurogenic or myogenic. The contraction of mammalian heart begins in a small piece of embryonic type muscle located where the vena cava enters the right atrium. This is known as sinoatrial node (S-A node). The contraction spreads to the two atria, and after a slight delay to the atrioventricular node (A-V node). From here it spreads rapidly to the tip of the ventricles through special muscle fibres, from where it spreads more slowly up the walls of the ventricles. This arrangement allows the contraction to begin at the tip of the ventricles and to spread upwards to squeeze out blood in the most efficient way. It also ensures that both ventricles contract simultaneously.
Explain the Meaning of Life Style Modification Life Style Modification (LSM) is an important aspect in the treatment of diabetes. LSM will help the people who are pre-diabetic
Cutaneous respiration in frog Frog belongs to class Amphibia under vertebrates. It is an amphibious animal which can live both on land and in water. Skin is very impor
Reptiles Heart is incomplete 4 chambered, ventricles are not divided completely 2 auricels & 2 ventricles. Sinus venosus present, Truncus artiorsus absent [In lizzard fo
Transfer RNA (tRNA) molecules play an very significant role in protein synthesis. Each tRNA becomes covalently bonded to a particular amino acid to create aminoacyl- t
Physical Lay Out: Physical lay out of the nursing unit should be planned and built in such a manner so that it helps the head nurse to discharge her duties/carry out her resp
What is the epidermis..
Where does Calvin cycle take place in chloroplast? Explain the cycle. a) Where is electron transport system operative in mitochondria? b) Explain the system highlighting the
Cell theory is one of the four (or five) unifying concepts in the biology. The cell theory states that all the living things are composed of at least one cell and that cell is the
TYPES OF SPERM Mainly two types . (1) Flagellated Sperm - Generally all sperm are monoflagelated, but in todfish or opsonus sperm is biflagelated. (2) Non flagellated spe
Single Cell Proteins (SCP) The term SCP was coined by Prof. Caroll Wilson (MIT) in 1966. It means the proteins obtained from microbial sources, i.e. algae, fungi, bacteria,
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: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd