The BOLD signal relies on measuring the signal difference between ________ and ________ blood. Deoxygenated ... Oxygenated Positively magnetized ... Negatively magnetized Excited ... Inhibited Radioactive ... Non-radioactive
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The BOLD signal relies on measuring the signal difference between oxygenated and deoxygenated blood. Oxygenated blood is positively magnetized, meaning it has a positive magnetic moment. This is because oxygenated hemoglobin contains paramagnetic properties Show more…
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How does the difference between the $\beta$ chain and the $\gamma$ -chain of hemoglobin explain the differences in oxygen binding between Hb A and Hb F?
Oxygenated hemoglobin absorbs weakly in the red (hence its red color) and strongly in the near infrared, whereas deoxygenated hemoglobin has the opposite absorption. This fact is used in a “pulse oximeter” to measure oxygen saturation in arterial blood. The device clips onto the end of a person’s finger and has two light - emitting diodes—a red (660. nm) and an infrared (940. nm)—and a photocell that detects the amount of light transmitted through the finger at each wavelength. (a) Determine the frequency of each of these light sources. (b) If 67% of the energy of the red source is absorbed in the blood, by what factor does the amplitude of the electromagnetic wave change? Hint: The intensity of the wave is equal to the average power per unit area as given by Equation 21.28.
Oxygenated hemoglobin absorbs weakly in the red (hence its red color) and strongly in the near infrared, whereas deoxygenated hemoglobin has the opposite absorption. This fact is used in a “pulse oximeter” to measure oxygen saturation in arterial blood. The device clips onto the end of a person’s finger and has two light-emitting diodes—a red (660 nm) and an infrared (940 nm)—and a photocell that detects the amount of light transmitted through the finger at each wavelength. (a) Determine the frequency of each of these light sources. (b) If 67% of the energy of the red source is absorbed in the blood, by what factor does the amplitude of the electromagnetic wave change? Hint: The intensity of the wave is equal to the average power per unit area as given by Equation 21.28.
Madhur L.
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