Answer: A buffer is a chemical substance that helps maintain a relatively constant pH in a solution, even in the face of addition of acids or bases. Buffering is important in living systems as a means of maintaining a fairly constant internal environment, also known as homeostasis. Because all biological processes are dependent on pH, cells and organisms must maintain a specific and constant pH in order to keep their enzymes in the optimum state of protonation. This system provides the maximum buffering capacity near pH 6.86 (the pKa of H2PO4- ). Several substances serve as buffers in the body, including cell and plasma proteins, hemoglobin, phosphates, bicarbonate ions, and carbonic acid. The bicarbonate buffer is the primary buffering system of the IF surrounding the cells in tissues throughout the body.
Explanation:
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Answer: C) Arterial system
Explanation:
Peripheral resistance to the blood flow is the resistance of arterial system as, peripheral resistance is exerted by the artery to the flow of blood . Among all vascular bed artery, capillary and vein, arteries are the vessel which has the property of recoiling due to smooth muscles to exert resistance. As, increase in peripheral resistance and blood volume result in higher blood pressure. It is the resistance of the arteries to the blood flow.
She makes 1440 a month,
all together the baby will cost 770 a month
it may be challenging because she will only have 670 left after expenses