Chambers of the heart, Biology

Assignment Help:

Chambers of the Heart

The heart is divided into two halves by a muscular wall or septum, the right heart and the left heart. The function of the right heart is to collect all venous return and propel it into the pulmonary vasculature. The function of left heart is to receive blood from pulmonary vasculature and propel it into systemic circulation.

Each half has an upper collecting chamber, the atrium and lower pumping chamber-the ventricles. The right atrium is a thin-walled chamber that has a small amount of myocardium, therefore it can accommodate changes in venous returns. The right atrium that serves as a reservoir for venous blood returning to the heart via the superior and inferior venacava and the coronary sinus. It stores blood during right ventricular systole (contractions). The right ventricle receives venous blood form the right artium during ventricular diastole (relaxation) and then propels this blood through the pulmonary valve into the pulmonary artery. The overall workload of right ventricle is less than that of left ventricle because the pulmonary system is a low-pressure system.

The thin-walled left atrium receives oxygenated blood from the four pulmonary veins and serves as a reservoir during left ventricular systole. Blood flows by gravity from left atrium into the left ventricle through the opened mitral valve during ventricular diastole. Blood is then ejected from the left ventricle through the opened aortic valve into the sustemic circulation during ventricular systole. The ventricle has thick walls because it must contract against a high pressure systemic circulation to deliver blood to the peripheral tissues.


Related Discussions:- Chambers of the heart

Treatments of coronary, The treatment of hyperlipidemia requires two approa...

The treatment of hyperlipidemia requires two approaches: Therapeutic lifestyle changes (TLC) and medications. To achieve target LDL levels, most patients need both approaches si

Sphaerosome, Sphaerosome Also known as Plant lysosome , because the...

Sphaerosome Also known as Plant lysosome , because they contain hydrolytic enzymes. Hanstei n first observed them and called microsomes . Discovered by Dangeared

Predation, Think back to the patterns of predator-prey cycling from Section...

Think back to the patterns of predator-prey cycling from Sections 2 and 3. Which of the three predator functional responses would you expect to be most likely to give stable popula

Lysosomes, Lysosomes Lysosomes are small vesicles which are bounded ...

Lysosomes Lysosomes are small vesicles which are bounded by a single membrane & contain hydrolytic enzymes in the form of minute crystalline or semi crystalline granules of

What is lap design, Lap design There are many different flap designs f...

Lap design There are many different flap designs for implant surgery. In practically all situations a mid-crestal incision can be employed (Fig). This is especially so when th

Health stroke scale, Health Stroke Scale: Stroke is a leading cause of...

Health Stroke Scale: Stroke is a leading cause of death, hospitalization, disability and health care expenditure in U.S. (Fonarow G. et al., 2012).  Stroke is a medical condit

What are important neurotransmitters, Q. What are some important neurotrans...

Q. What are some important neurotransmitters? The following are some neurotransmitters: serotonin, noradrenaline (norepinephrine), histamine,acetylcholine, adrenaline (epinephr

What are the chronic complications of diabetes, Q. What are the Chronic com...

Q. What are the Chronic complications of diabetes? • Atherosclerosis: Degeneration of walls of the arteries due to fatty plaques - deposition on arterial walls. Diabetics ar

Complications in circulatory assist devices, Complications : IABP can comp...

Complications : IABP can compromise blood flow to the leg at the time of insertion, pumping or after removal of balloon. It may also cause perforation, bleeding, thrombosis, embol

Foods for phenylketonuria patient, Q. Foods for phenylketonuria patient? ...

Q. Foods for phenylketonuria patient? The majority of foods for a PKU patient should come from the bottom half of the pyramid. As you may have observed, this contains the pheny

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd