Answer:
same atmospheric pressure?
1 and 2
2 and 3
2 and 4
The pressures in the atria and ventricles that would cause the AV valves to open. This is when the pressure in the atria would be greater than the pressure in the ventricles.
<h3>What does pressure in the atria cause?</h3>
The pressure drops below 120 mmHg as the ventricles relax, causing the semilunar valves to close. As the pressure continues to fall, the atrial pressure exceeds that of the ventricles, and the atrioventricular valves open. Meanwhile the blood is being pumped around the body.
With this information, we can conclude that the pressure in the atria would be greater than the pressure in the ventricles.
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Hair Matrix
The hair matrix is wrapped almost totally around the papilla. It is a collection of cells, primarily comprising of epithelial cells and some pigment-producing cells called melanocytes. The continuous division of cells in the hair matrix forms the hair shaft (the strands of hair that we actually see) and the inner and outer root sheaths of the hair.
Answer:
<em>What are three measures of life variations?</em>
<em>Species diversity, genetic diversity, ecosystem diversity</em>
Explanation:
<em>Biodiversity</em>
<em>The amount of biological or living diversity per unit area. It includes the concepts of species diversity, habitat diversity and genetic diversity.</em>
<u><em>I hope this helps and have a great day!</em></u>