One of your friends has anemia. They consistently complain of higher levels of fatigue when you go for runs or exercise. What is the cause of this?     Decreased oxygen carrying capacity of myoglobin   Decreased muscle spindle activation of the gastroc   Increased use of fast twitch muscle fibers   Decreased oxygen carrying capacity of hemoglobin

In sickle cell disease: O poor oxygen binding causes deformation of red blood cells a mutation in the B-chain of hemoglobin causes hemoglobin to polymerize into fibres that distort red blood cells. O the oxygen binding curve of hemoglobin must be shifted to the left hemoglobin is no longer able to bind oxygen myoglobin is not longer able to bind BPG.

Caffeine lowers the heart rate by increasing rates of depolarization at the SA node   True False   Nicotine raises the heart rate because it stimulates the activity of the sympathetic neurons in medulla oblongata   True False   The Frank-Starling Law of the Heart states that the force of heart contraction is directly proportional to the initial length of the muscle fiber, within optimal limits of length   True False If the sarcomeres stretched beyond the optimal length, the force of contraction would go down, but that can potentially happen only during open heart surgery when the heart is not constrained by the pericardium, lungs, ribs and diaphragm.   True False It is the Na+ channel-driven spontaneous depolarization that is affected by sympathetic and parasympathetic inputs to speed up or slow down the firing rate of the SA node and other conductive cells.   True False

When a person develops a fever, which of the following statements hemoglobin saturation are correct?  - Modify the structure of hemoglobin and decrease its affernity for O2 - Can shift the O2-hemoglobin dissociation curve to the right - Decrease O2 unloading occurs in the tissue  - Modify the structure of hemoglobin and increase its affernity for O2 - Can shift the O2 hemoglobin dissociation curve to the left - Enhance O2 unloading occurs in the tissue

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Which of the following is TRUE about carbon dioxide binding to hemoglobin? Carbon dioxide carbamoylates the N-terminus, stabilizing the T-state Carbon dioxide binds to the central cavity in hemoglobin, stabilizing the T-state. Carbon dioxide, binds to the heme iron, stabilizing the T-state. None of the above are true. 1 UNANSWERED QUESTION 1/1 SKIP FOR NOW 14:03 / 14:11 MacBook Pro