Overview
β receptors are classified into three subclasses: β1, β2, and β3. β1 receptors are primarily located in the heart and kidneys. When they get activated, they increase heart rate, contractility, and renin release. This process enhances blood pressure and aids in stress management. In contrast, β2 receptors are situated mainly in the lungs, blood vessels, and skeletal muscles. Upon activation, they trigger smooth muscle relaxation, causinghodilation and vasodilation. This widens airways and blood vessels, improving oxygen delivery to tissues, reducing airway resistance, and aiding respiration. Beta antagonists, or beta-blockers, block beta-receptor sites by competing with norepinephrine and epinephrine. They are categorized as nonselective and selective. Nonselective beta-blockers target both β1 and β2 receptors, while selective ones focus solely on β1 receptors. Nonselective beta-blockers like propranolol inhibit β1 receptor activity in hypertensive patients, reducing heart rate, contraction force, and renin release. As a result, peripheral resistance, blood volume, and blood pressure decrease. However, due to its nonselective nature, propranolol inhibits the β2-mediated bronchodilation, which can lead to increased airway resistance. This exacerbates respiratory conditions in asthma or chronic obstructive pulmonary disease (COPD). Selective beta-blockers such as me…
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Embed code vs URL
An embed code allows you to place a JoVE video directly inside of your learning or training environment. Most learning management systems such as Canvas, Blackboard, and Moodle require an embed code for JoVE content to stream.
A URL allows you to place a link in programs such as PowerPoint or Microsoft Word which takes a user to a separate page where they can watch a JoVE video.
Most of the time, you will want to use the embed code. However, there are some environments that don’t support embed codes such as Google Classrooms and MS Teams. In those instances, you can use a URL to still provide access to JoVE videos.
What is an Embed Code?
Basically, it’s a snippet of code that you put on your website that displays as a video. An embed code pulls the video from the original source, allowing you to display a video without having to host the file on your website.
How to embed a video
STEP 1: COPY YOUR EMBED CODE
To generate the embed code, simply click the Copy button above. You can customize it by choosing a specific language for the video, or setting exact dimensions for the video player.
STEP 2: PASTE THE EMBED CODE INTO YOUR ENVIRONMENT
Embed codes can be used in most learning management systems (Canvas, Blackboard, Moodle…), organizational websites, and a host of other tools. The specifics of how to add in an embed code will depend on your environment.
Generally, it involves accessing a text editor, entering the HTML mode on the editor, and pasting in the embed code. Get more details on embedding into specific environments here.