The right answer is <span>Refractory period.
At the moment when the action potential is emitted, the fiber being depolarized, it is impossible to depolarize it again. It is, therefore, necessary to wait until the membrane potential returns to a value below the critical threshold in order to be able to excite it again. We are thus led to distinguish two periods that characterize its excitability.
An absolute refractory period: during which any stimulation, even supraliminal, is ineffective since the fiber is already depolarized.
A relative refractory period: during which a second action potential can be omitted provided that the depolarization produced by the excitation reaches the critical threshold, which implies that it is more important since the value of the resting potential has not been restored yet.</span>
Answer:
The Mitral/Bicuspid Valve
Explanation:
The heart is composed of 4 chambers: left and right atria, and left and right ventricles. The “right heart” (right atrium and ventricle) receives deoxygenated blood from the systemic circulation through the Vena Cava, and impels this blood towards the lungs through the Pulmonary Arteries where it will be oxygenated. The “left heart” (left atrium and left ventricle) receives oxygenated blood from the pulmonary circulation through the Pulmonary veins and impels this blood towards the systemic circulation through the Aorta artery.
The systemic and pulmonary circuits work in series, and maintaining the unidirectional course of the blood flow is very important. This can be done by the presence of fibrous valves that are present between the atrium and the ventricles, and in between the ventricles and the Pulmonary/Aorta artery.
The location of these structures are as follows:
Systemic circulation ⇒ Right Atrium → [Tricuspid Valve] → Right Ventricle → [Pulmonary Valve] → Pulmonary Artery ⇒ Pulmonary circulation
Pulmonary circulation ⇒ Left Atrium → [Mitral/Bicuspid Valve] → Left Ventricle → [Aortic Valve] → Aorta ⇒ Systemic circulation
Answer:
c. ATP is comprised of a sugar, base, and three phosphate groups
Explanation:
ATP is the energy currency of cells and is formed during the phosphorylation of ADP. The process of ATP formation is endergonic and is often coupled with some exergonic process.
One molecule of ATP consists of one ribose sugar, an adenine base (a purine base) and three phosphate groups. Breakage of phosphoanhydride bond during hydrolysis of ATP into ADP and inorganic phosphate release a large amount of energy.
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Answer:
qualitative
Explanation:
<u>Identifying where the barnacle is found of the boat will result in qualitative data, rather than quantitative.</u>
Qualitative data has to do with attributes that cannot be measured but can only be observed, approximated, and characterized, Examples include presence/absence, beautiful/ugly, black/white, etc. On the other hand, quantitative data has to do with attributes that can be measured, such as height, number of leaves, etc.
<em>Identifying where the barnacle is found on the boat has nothing to do with measurement. It only has to do with recording the presence or absence of barnacle in various locations on the boat. Hence, it is qualitative data.</em>
