Answer:
immunobiology cause infections and diseases
When you have a good amount of sunlight the growth of the plant will increase
The term "dead air spaces" refers to air passages like your trachea (windpipe) that may contain air your body can't use.
<h3>What does trachea mean?</h3>
Your larynx, or voice box, and your lungs are connected by a long, U-shaped tube called your trachea. The windpipe is another name for the trachea. It is an essential component of your respiratory system. Air enters your lungs through your larynx when you breathe in.
<h3>What are the trachea's four purposes?</h3>
- Tracheal Activity
- The airway from the mouth or nose to the lungs should be made strong and secure.
- Prevent foreign things from entering the respiratory system.
- control the air entering the lungs' temperature and humidity levels.
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Answer: Option D.
The lub heart sound is due to the closing of atrioventricular valves.
Explanation:
Heart sounds are noises that are generated from beatings from heart and from blood that flows through it. The heart sound reflect the turbulence generated when the heart valves snap shut. Lub is the first heart sound also called S1 and it is caused by turbulence and closure of the atrioventricular valves(mitral and triscupid valves) at the start of systole. The second sound is the dub sound which caused by the closing of aortic and pulmonic valves at the end of systole.
