Google Analytics is a powerful tool that tracks and analyzes website traffic for informed marketing decisions.
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__utmb
Used to distinguish new sessions and visits. This cookie is set when the GA.js javascript library is loaded and there is no existing __utmb cookie. The cookie is updated every time data is sent to the Google Analytics server.
30 minutes after last activity
__utmc
Used only with old Urchin versions of Google Analytics and not with GA.js. Was used to distinguish between new sessions and visits at the end of a session.
End of session (browser)
__utmz
Contains information about the traffic source or campaign that directed user to the website. The cookie is set when the GA.js javascript is loaded and updated when data is sent to the Google Anaytics server
6 months after last activity
__utmv
Contains custom information set by the web developer via the _setCustomVar method in Google Analytics. This cookie is updated every time new data is sent to the Google Analytics server.
2 years after last activity
__utmx
Used to determine whether a user is included in an A / B or Multivariate test.
18 months
_ga
ID used to identify users
2 years
_gali
Used by Google Analytics to determine which links on a page are being clicked
30 seconds
_ga_
ID used to identify users
2 years
_gid
ID used to identify users for 24 hours after last activity
24 hours
_gat
Used to monitor number of Google Analytics server requests when using Google Tag Manager
1 minute
_gac_
Contains information related to marketing campaigns of the user. These are shared with Google AdWords / Google Ads when the Google Ads and Google Analytics accounts are linked together.
90 days
__utma
ID used to identify users and sessions
2 years after last activity
__utmt
Used to monitor number of Google Analytics server requests
10 minutes
Structure of 3 layers of the heart
Epicardium – thin, transparent, outer layer of the heart wall (visceral pericardium) which is composed of mesothelium and delicate connective tissue that imparts a smooth, slippery texture to the outermost surface of the heart
Myocardium – cardiac muscle tissue that makes up about 95% of the heart and is responsible for its pumping action. It is striated and involuntary.
Endocardium – a thin layer of endothelium overlying a thin layer of connective tissue that provides a smooth lining for the heart chamber and covers the heart valves. It is continuous with the endothelial lining of large blood vessels attached to the heart and minimizes surface friction as blood passes.
4 chambers of the heart
Right atrium – is about 2-3 mm thick and forms the right border of the heart which receives blood from the epicardium, superior and inferior vena cava, and coronary virus.
Left atrium – same thickness as RA and forms most of the base of the heart. It receives blood from the lungs through four pulmonary veins.
Right ventricle – about 4-5 mm thick and forms most of the anterior surface of the heart. Blood passes from the right ventricle through the pulmonary valve into the large artery.
Left ventricle – is about 10-15 mm thick and forms the apex of the heart. Blood passes from the left ventricle through the aortic valve into the ascending aorta.