The countercurrent heat exchanger that prevents arterial blood from overheating the testes is the pampiniform plexus of veins. The pampiniform plexus helps to regulate testicular temperature, allowing sperm maturation. It surrounds the testicular arteries and works as a countercurrent heat-exchanger system to cool the arterial blood before entering the testes. This is because the sperms can not develop if the testis is at body temperature.
The answer you would be looking for is B because Retrovirus is a single strand of a RNA virus.
This is a neutral atom of chlorine.
The correct answer is A. is a measure of the hydrogen ion concentration.
Explanation:
The pH determines how acid or alkaline a substance is, usually by classifying substances and mainly solutions on a scale from 0 to 14, in which 7 represents a neutral substance. This property is determined based on the hydrogen ion concentration, in this way a substance with a high hydrogen ion concentration is more acid that one with a low hydrogen ion concentration. Additionally, in this scale solutions are classified as acidic if they have a pH lower than 7 or as basic if the pH is higher than 7. According to this, it can be concluded pH is a measure of the hydrogen ion concentration.
<span>The nitrogenous base pairs, which are linked by hydrogen bonds that also hold the strands together, are between this backbone. However, the nitrogenous bases, which are adenine, thymine, cytosine and guanine, pair up so that cytosine only pairs with guanine and adenine links up with thymine.</span>