What happens in you in a Heartbeat?

Today we'll study something interesting. We want to peep into our hearts and see what really happens each time we feel our hearts beating. It is called the CARDIAC OR HEART CYCLE.

--------------------------------------------------------------------
The Cardiac Cycle.

Describes all the activities of the heart through one complete heartbeat; that is through one contraction and relaxation of the ventricles and atria.

Phases of the Cardiac Cycle.
The cardiac cycle is majorly divided into two known as the systole and diastole.

The Diastole is the phase where the atria and ventricles are in a relaxed mode.
- During this phase blood is pumped into both straight from the large veins of systemic circulation; ( superior and inferior Vena Cava) and the pulmonary veins.

- Blood fills the ventricles passively as both the mitral and tricuspid valves that are at located between the ventricles and atria are lifted.

- The left atrium receives oxygenated blood from the pulmonary veins while the right receives deoxygenated from the superior and inferior vena cava.

- At the end stage of the diastolic phase the atria begin to contract and propel additional blood into the respective ventricles.

The Systole.
This phase refers to the period during which the ventricles contract and eject blood into the aorta for circulation and pulmonary arteries for oxygenation respectively.

- This phase begins with the closure of the valves between the atria and ventricles and that closure is what is responsible for the first heart sound you hear.

The heart beats in a 'lub-dub' fashion, the 'lub' being the first heart sound and the second which is happens as a result of the closure of the aortic and pulmonary valves following the pumping of blood.

All these activities take place in just a heartbeat.
So each time you feel your heart beat. Just remember that is what happens during those split seconds.

Credits:
Science direct.com
The physiologist.org
Cliff notes.com
Lumenlearning.com
cvphysiology.com

Comments

Tips on Nose bleeding.

Hello friends how's been your week so far This week we'll be looking at Nose Bleeding. This is something a lot of us are familiar with, so we'll just throw some more insight into what it is and how to handle it. Things to know about Nose Bleeding. As the name implies, nose bleeding simply means bleeding through the nose. Nose bleeds are common. They maybe scary but rarely indicate a serious medical problem. The nose is abundantly supplied by blood vessels hence its vulnerability to easily bleed. Nose blessing can be categorized based on where it originates and so based on that we have basically two types of nose bleeding. 1. Anterior nose bleed. - Usually originates from the front part of the nose. - The bleeding usually originates from a blood vessel on the nasal septum where a network of blood vessels converge. - They are easy to control either by measures that can be performed at home or by a health care giver. 2. Posterior nose bleed. - Originat...

What to do when you have 'PINK EYE'( Conjunctivitis).

Conjuctivitis popularly known as the 'Pink eye' or 'apollo' as it is popularly called in Nigeria is an infection of the white part of the eye ball. This infection is most times caused by bacteria, viruses and allergies. The most common type is the viral infection. According to the University College of Medicine, Ibadan, Nigeria, about 1.5 million cases of conjuctivitis are seen yearly. MODE OF SPREAD. Conjuctivitis can be extremely contagious and can be spread through the following ways; * Through skin to skin contact eg handshake with an infected person. * By touching a surface contaminated with secretions from an infected eye. *Almost all age groups can be affected by this ailment but the most vulnerable group are children between the age of 3-13years. * Though contagious it rarely damages the eye especially when treated on time. SYMPTOMS OF 'PINK EYE'. - Redness. - Thick yellowish discharge t...

The Crisis of Identity.

When we went from placing value on what really matters to just external things humanity fell so hard and broke it's back. The impact of that fall is why we have so many people with low self esteem and terrible identity crises. Much more than failing economies, hunger, disease, widespread poverty is the crisis of the individual. The crisis of seeking validation, of feeling some sort of worth and value. That inner questioning and probing that requires an answer. Sadly many people do not have the answer to that inner question. They then turn to things, all kinds of external things and invite them to come in and answer that inner man. Unfortunately the externals can't do so. They lack the capacity to answer those questions and the individual in a bid to either answer or silence that question seeks more of these externals and at every point they keep saying No, we don't have the answers. The individual is now confused, what do I do? Then he sights another human li...

jpmreloaded

Search This Blog