Google Analytics is a powerful tool that tracks and analyzes website traffic for informed marketing decisions.
Service URL: policies.google.com (opens in a new window)
_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
__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
_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
Histology Art (MT 30 – I) 2022 4 years, 5 months ago Histology Art for the Respiratory System Body Tissues.
The pulmonary alveolus (plural: alveoli) is a small air sac that serves as the fundamental respiratory unit. It is a hollow cup-shaped cavity in the lung parenchyma that facilitates gas exchange. Lung alveoli are situated near the beginning of the respiratory zone in the acini. They are found infrequently in the respiratory bronchioles, lining the alveolar duct walls. The alveoli are found in the pulmonary lobules of the respiratory zone, in the alveolar sacs of the lungs. They are more prevalent in blind-ended alveolar sacs. Respiratory bronchioles connect to alveolar ducts, which are lined with alveoli. Each respiratory bronchiole produces two to eleven alveolar ducts. Each duct divides into five or six alveolar sacs, each of which contains a cluster of alveoli.
In most people, the trachea, often known as the windpipe, is a 4 inch long tube with a diameter of less than an inch. The trachea starts right below the larynx (voice box) and goes down beneath the breastbone (sternum). The trachea subsequently separates into two smaller tubes called bronchi, one for each lung. The trachea is made up of around 20 rings of strong cartilage. The back of each ring is formed of muscle and connective tissue. The mucosa, or moist, smooth tissue, coats the inside of the trachea. With each inhalation, the trachea slightly expands and lengthens before reverting to its resting size with each exhalation.
The epiglottis is a cartilaginous flap that extends in front of and above the laryngeal intake, also known as the rima glottidis (glottis). The epiglottis closes the laryngeal inlet during swallowing, preventing food and fluids from entering the lungs (aspiration). This is why we can’t (and shouldn’t attempt) to talk and breathe while swallowing. The epiglottis is found in the larynx and is connected to the thyroid cartilage and hyoid bone. Its motions are controlled by the tongue’s passive pressure as it pulls food down the pharynx, as well as the contractions of the aryepiglottic muscle.
https://www.webmd.com/lung/picture-of-the-trachea
https://www.kenhub.com/en/library/anatomy/epiglottis
https://www.cancer.gov/publications/dictionaries/cancer-terms/def/alveoli