Heart Circulations

This video is about heart. It explains to us about the structure and the functioning of the heart. It shows us the left atrium, left ventricle, right atrium and the right ventricle.

 

The heart is a hollow muscular organ that pumps blood throughout the blood vessels to various parts of the body by repeated, rhythmic contractions.[1] It is found in all animals with a circulatory system, which includes the vertebrates.[2]

The adjective cardiac means “related to the heart” and comes from the Greek καρδιά, kardia, for “heart”. Cardiology is the medical speciality that deals with cardiac diseases and abnormalities.

The vertebrate heart is principally composed of cardiac muscle and connective tissue. Cardiac muscle is an involuntary striated muscle tissue specific to the heart and is responsible for the heart’s ability to pump blood.

The average human heart, beating at 72 beats per minute, will beat approximately 2.5 billion times during an average 66 year lifespan, and pumps approximately 4.7-5.7 litres of blood per minute. It weighs approximately 250 to 300 grams (9 to 11 oz) in females and 300 to 350 grams (11 to 12 oz) in males.[3]

heart

Safer Internet

Safer Internet Day was on 11 Feb 2014safer!

 This year’s theme was ‘Let’s create a better internet together’, offering the opportunity   to focus on both the creative things that children and young people are doing online, as well as the role we all play in helping to create a better internet.

 

 

 

 

what is an internet

The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite (TCP/IP) to link several billion devices worldwide. It is a network of networks that consists of millions of private, public, academic, business, and government networks, of local to global scope, that are linked by a broad array of electronic, wireless, and optical networking technologies. The Internet carries an extensive range of information resources and services, such as the inter-linked hypertext documents and applications of the World Wide Web (WWW), the infrastructure to support email, and peer-to-peer networks for file sharing and telephony.

Project Based Learning

Project-based learning is considered an alternative to paper-based, rote memorization, teacher-led classrooms. Proponents of project-based learning cite numerous benefits to the implementation of these strategies in the classroom including a greater depth of understanding of concepts, broader knowledge base, improved communication and interpersonal/social skills, enhanced leadership skills, increased creativity, and improved writing skills.