Answer:
B) The "lub-dub" sound originates from blood turbulence through the heart.
Explanation:
The systole and diastole in the heart produce the lub and dub sound in the heart.
The systole represents the contraction of both left and right ventricles and pumps the blood to the body and the right ventricle to the lungs. This involves the opening and closing of the valves. The closing of the atrioventricular valves produces lub sound.
At the end of the systole or ventricular contraction or when the blood has been pumped to the aorta and the pulmonary valves then the semilunar valves present in the aorta and pulmonary closes. This produces a sound dub.
Therefore,lub dub is associated with the physical contraction of the heart but not the turbulence of the blood.
Thus, the selected option is the correct answer.
Answer:
glacial landforms
Explanation:
Glaciers cause erosion by plucking and abrasion. Glaciers deposit their sediment when they melt. Landforms deposited by glaciers include drumlins, kettle lakes, and eskers.
Answer:
Organic compounds are those compounds having carbon and hydrogen atoms called Hydrocarbon and their derivatives. For example, Methane, Ethane, Glucose and sucrose while
Inorganic compounds are those compounds which have no carbon and hydrogen atoms. For example, carbondioxide, nitrious oxide, carbonmonoxide, carbonates and bicarbonates.
Glycolysis results in the formation of 2 ATP molecules, 2 Pyruvic Acid molecules (Or Pyruvate), and 2 NADH molecules.
The answer is oropharynx. The oropharynx is the center some portion of the pharynx (throat) behind the mouth. It incorporates the accompanying: Back 33% of the tongue. A delicate sense of taste. Side and back dividers of the throat.
