Answer:
The semilunar valves prevent backflow of blood into the ventricles.
Explanation:
The semilunar valves are valves found at the junction between the left ventricle and the aorta and also between the right ventricle and the pulmonary artery. They are cup-like in shape and prevent blood from flowing back into the ventricles which are the pumping chambers.
There are two types of semilunar valves. The aortic semilunar valves and the pulmonary semilunar valves. They are made up of the endocardial and connective tissue.
The closure of the semilunar valves causes the second heart sound detected on the stethoscope.
Diseases that arise from the semilunar valves are caused by its stenosis which is the narrowing of the valves and regurgitation where the heart valves can no longer hold firm enough to prevent the backflow of blood.
True
A confounding variable is an “extra” variable that you didn’t account for. They can ruin an experiment and give you useless results. They can suggest there is correlation when in fact there isn’t. They can even introduce bias. That’s why it’s important to know what one is, and how to avoid getting them into your experiment in the first place.
Answer:
Bacteria
Explanation:
Their cell wall is made of this and they are also unicellular. They eat other things and cannot make their own food
Answer:
Enzymes allow many chemical reactions to occur within the homeostasis constraints of a living system. Enzymes function as organic catalysts. ... By bringing the reactants closer together, chemical bonds may be weakened and reactions will proceed faster than without the catalyst.
Explanation:
Answer:
The correct answer would be B) produces water.
Aerobic respiration is a type of respiration in which oxygen is used as the final acceptor of the electrons in an electron transport chain.
It usually takes place in mitochondria of a cell except for glycolysis part which takes place in the cytoplasm.
In this respiration, carbon in glucose is oxidized to produce carbon dioxide whereas oxygen is reduced to form water.
H₂ + 1/2 O₂ →H₂O
In contrast, anaerobic respiration usually occurs in the cytoplasm and results in the formation of lactic acid or ethanol and ATP.
