Is there supposed to be a photo attached?
B. ventricles
The chordae tendinae, also referred to as heart strings, are tendons that connect the atrioventricular (tricuspid) valves to the muscular wall of the heart. These chords are made predominantly of collagen, while the remaining part is elastin. They play the vital role of maintaining the structure of the valves they connect to. Due to the high pressure generated within the heart, it is entirely possible for the atrioventricular valves to turn inside out. The chordae tendinae prevent this from happening and keep the valves functioning properly.
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Which of the following statements explains how strains of methicillin-resistant Staphylococcus aureus appeared two years after doctors began using the antibiotic methicillin?
- The drug-resistant bacteria existed in the population but did not have an advantage until the environment changed with the introduction of methicillin.
- In response to the treatment with methicillin, the bacterial population gradually began to synthesize cell walls using a protein that was not affected by the drug.
- The bacteria that survived the drug methicillin, developed an immunity to the drug.
- The bacteria mutated in response to the drug and began making drug-resistant versions of proteins need to build cell walls.
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In response to the treatment with methicillin, the bacterial population gradually began to synthesize cell walls using a protein that was not affected by the drug.
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With the process of pressure and heat, rocks can change from magma or sediment to different rocks.