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Histoires inspirantes de femmes scientifiques africainesUncategorized
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RESPECT FOR WOMEN IS PARAMOUNTNetworking
The eating of the heart is myogenic meaning that it is initiated from within heart muscles, itself and not as a result of nervous imputes, teaching them.
(Myogenic property is used in heart transport sungery) whereas it is initiated by nerves as in insects it is solid be neuragenic.
The initial stimulus for a heart beat originates in a group of hitologically different muscle cells known as the Sino Artial Node
Summary of path taken by electrical excitation during the cardiac cycle.
SAN ATRIA AVN Purkinje Ventricles
(PACEMAKER) tissue
(Bundle of It is)
HEART SHOWING THE SPREAD OF ELECTRICAL EXCITATION THAT ACCOMPANIES CONTRACTION.
INNERVAITON OF THE HEART
TYPES OF CIRCULATION SYSTEMS
The different types of circulatory system may fall under the following:-
Closed circulations are where the blood flows within vessels or sinuses and does not come into contact with the tissue directly e.g. Blood flow in annelids e.g. Earthworm.
– Mammals – Fish
– Amphibians
The Earth worm has 5 pseudo heart located in segments 7-11
OPEN CIRCULATION SYSTEMS
Is one in which blood does not move within vessels but through the body cavity called harmocoel and moves freely over the tissues e.g. arthropods e.g. insects.
SINGLE AND DOUBLE CIRCULATION
If the heart of a mammal is compared to that of the fish and frogs, the fish has the simplest.
Solutions to the problem.
FISH’S HEART SHOWING SINGLE CIRCULATION
Difference between the two should follow the above.
Differences ahead, read on
No need to leave this space.
CIRCULAITON IN THE FROG
Various foldings into the wall of the ventricle aided by spiral value in the conus anterious may play an important role in separating oxygenated blood from mixing deoxygenated blood.
THE AMPHIBIAN WITH DOUBLE CIRCULATION
DOUBLE CIRCULATION OF BLOOD TO ALL BODY PARTS IN MAMMAL.
THE OPEN CIRCULATION IN ARTHROPODS e.g. in insects.
Why an open system but not a closed system exists in insects.
The reason lies in the way arthropods develop. In most animals the embryological cavity called coelom that eventuall becomes the main body cavity expands at the expense of the cavity calle blastocoel which eventually forms blood vessels. In arthropods, the revense takes place.
The coelomic cavities remain small and the blastocoel becomes the main cavity. Insect; arthropods rows faster developing open circulating system.
STRUCTURE OF AN INSECTS’ OPEN CIRCULATION SYSTEM.
ASSIGNMENT : MECHANISM OF HEART EXCITATION AND CONTRACTION Assignment MARKS : 10 DURATION : 24 hours