When are the Korotkoff sounds loudest?

Endurance athletes sometimes try an illegal method of blood doping called autologous transfusion. Some blood from the athlete is removed well before competition, and then transfused back into the athlete just before competition. (a) Why might blood transfusion benefit the athlete? (b) With time, stored red blood cells become depleted in 2,3-BPG. What might be the consequences of using such blood for a blood transfusion?

2) attached to the heart. You are looking at the heart as it would appear in the chest of a person sitting in front of you. a)_Identify the structures (A-H). Hint: All structures are chambers of the heart or vessels b) Label the BASE and APEX of the heart in the diagram. c) List (in order) 7 structures in the path of blood as it travels from structure F in the diagram to structure A in the diagram (the names of F and A are included in your list of 7!). You will need to include 2 types of peripheral vessels not shown in the diagram in your list in order to complete the circuit. | A H F D A В E F G H

Which nerve(s) transmit an action potential from the brain to the heart? a) the vagus nerve only   b) the vagus and glossopharyngeal nerves   c) the vagus and phrenic nerves   d) the phrenic and glossopharyngeal nerves   e) the phrenic nerve only

What condition(s) does increasing the diameter of the left flow tube simulate in the human heart (A) increasing afterload (B) increasing preload (C) increasing viscosity of the blood (D) increasing the contractility of the ventricles

Which of the following is/are true concerning the opening and closing of the cardiac valves? A. valves operate according to the pressures on either side of the valve B. valve operation is constantly being controlled by the medulla oblongata C. valve operation is determined directly by the cardiac action potential (electrical currents control the opening and closing of the valves.) D. valve operation is directly controlled by the papillary muscles within the ventricular wall. E. None of the above is correct.

The _________ regional nuclei of the medulla oblongata is responsible for the origin and stimulation of cranial nerve X. A) cardiac acceletory B) vascular inhibitory C) vascular neutrality D) cardiac inhibitory

What is the direct effect (prior to any reflex compensation) of administeringintravenously a selective beta 1 receptor agonist?A)Increased heart rate, stroke volume and total peripheral resistance.B)Increased total peripheral resistance and renin secretion.C)Increased heart rate and stroke volume.D) Increased total peripheral resistance and decreased renin secretion.E) Decreased renin secretion, total peripheral resistance and heart rate.

The peripheral chemoreceptors that respond to oxygen levels of the blood and regulate heart activity are located in Select one: a. structures near the carotids and aortic arch. b. the infundibulum of the hypothalamus. c. the left ventricle. d. the right ventricle. e. the medulla oblongata.

a. How many subunits does hemoglobin have? What are their conventional names? b. Identify the oxygen binding sites on hemoglobin. How many oxygens can one molecule of hemoglobin bind? How many oxygens can one subunit of hemoglobin bind? c. Identify the central cavity of hemoglobin. Is it the same or different than the oxygen binding site of hemoglobin?