Body Fluids and Circulation

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What is the primary function of the medulla oblongata in regulating cardiac activity?

To regulate the sympathetic and parasympathetic nervous systems (correct)

To produce adrenal medullary hormones

To decrease the rate of the heartbeat and cardiac output

To increase the rate of the heartbeat and cardiac output

What is the approximate percentage of plasma in the blood volume?

70-75%

50-55% (correct)

40-45%

60-65%

What is the primary function of the parasympathetic nervous system in regulating cardiac activity?

To regulate the sympathetic nervous system

To produce adrenal medullary hormones

To decrease the rate of the heartbeat and cardiac output (correct)

To increase the rate of the heartbeat and cardiac output

What is the term for the cells suspended in the fluid matrix of blood?

Formed elements Signup and view all the answers

What is the primary function of blood in the body?

To transport oxygen and nutrients throughout the body Signup and view all the answers

What is the term for the fluid matrix of blood that contains various dissolved components?

Plasma Signup and view all the answers

What is the term for the rhythmic contraction and relaxation of the heart chambers?

Heart rate Signup and view all the answers

What is the unit of measurement for cardiac output?

Liters per minute Signup and view all the answers

Which of the following pressures is measured during the relaxation of the heart muscle?

Diastolic pressure Signup and view all the answers

What is the name of the device used to measure blood pressure?

Sphygmomanometer Signup and view all the answers

What is the force that drives the flow of blood from the heart through the arteries and arterioles to the capillary beds?

Blood pressure Signup and view all the answers

Why is blood pressure only calculated in arteries?

Because the blood pressure in arteries is much higher than in veins Signup and view all the answers

What is the primary mechanism by which the blood in the ventricles flows into the pulmonary artery and the aorta?

The semilunar valves are forced open Signup and view all the answers

During which phase of the cardiac cycle does the majority of the blood flow from the atria to the ventricles?

Atrial systole Signup and view all the answers

What is the average heart rate in a normal individual?

70-75 beats per minute Signup and view all the answers

What is the name of the sound produced by the closure of the atrioventricular valves?

Lub Signup and view all the answers

What is the volume of blood pumped out by each ventricle during a single cardiac cycle?

70 mL Signup and view all the answers

What is the relaxation phase of the cardiac cycle known as?

Diastole Signup and view all the answers

Which part of the nervous system is responsible for increasing the rate of the heartbeat and strength of ventricular contractions?

Sympathetic nervous system Signup and view all the answers

What is the primary function of plasma in the blood?

To carry away carbon dioxide and waste products from body cells Signup and view all the answers

Which of the following hormones increases the cardiac output?

Adrenaline Signup and view all the answers

What is the term for the cells suspended in the fluid matrix of blood?

Formed elements Signup and view all the answers

Which nervous system decreases the rate of the heartbeat and speed of conduction of action potential?

Parasympathetic nervous system Signup and view all the answers

What is the percentage of plasma in the blood volume?

55% Signup and view all the answers

What is the primary function of the circulatory system?

To provide nutrients, gases, and hormones to different parts of the body Signup and view all the answers

What is the difference between open and closed circulatory systems?

Open circulatory systems pump hemolymph through vessels, while closed circulatory systems pump blood Signup and view all the answers

What is the role of the heart in the circulatory system?

To pump circulatory fluid throughout the body Signup and view all the answers

What is the function of blood in the body?

To transport oxygen and carbon dioxide Signup and view all the answers

What is the term for the fluid matrix of blood that contains various dissolved components?

Plasma Signup and view all the answers

What is the purpose of the excretory system in relation to the circulatory system?

To collect and remove waste from the body Signup and view all the answers

What is the main function of chordae tendinae and papillary muscles?

To regulate the opening and closing of bicuspid and tricuspid valves Signup and view all the answers

What is the characteristic of arteries that carry oxygenated blood?

They are pinkish or bright red in color Signup and view all the answers

What is the function of capillaries in the circulatory system?

To allow exchange of gases and other materials Signup and view all the answers

What is the type of circulation found in fish?

Single circulation Signup and view all the answers

What is the outermost layer of arteries and veins?

Tunica externa Signup and view all the answers

What is the structure that guards the opening between the right atrium and right ventricle?

Tricuspid valve Signup and view all the answers

Body Fluids and Circulation

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Questions and Answers

What is the primary function of the medulla oblongata in regulating cardiac activity?

What is the approximate percentage of plasma in the blood volume?

What is the primary function of the parasympathetic nervous system in regulating cardiac activity?

What is the term for the cells suspended in the fluid matrix of blood?

What is the primary function of blood in the body?

What is the term for the fluid matrix of blood that contains various dissolved components?

What is the term for the rhythmic contraction and relaxation of the heart chambers?

What is the unit of measurement for cardiac output?

Which of the following pressures is measured during the relaxation of the heart muscle?

What is the name of the device used to measure blood pressure?

What is the force that drives the flow of blood from the heart through the arteries and arterioles to the capillary beds?

Why is blood pressure only calculated in arteries?

What is the primary mechanism by which the blood in the ventricles flows into the pulmonary artery and the aorta?

During which phase of the cardiac cycle does the majority of the blood flow from the atria to the ventricles?

What is the average heart rate in a normal individual?

What is the name of the sound produced by the closure of the atrioventricular valves?

What is the volume of blood pumped out by each ventricle during a single cardiac cycle?

What is the relaxation phase of the cardiac cycle known as?

Which part of the nervous system is responsible for increasing the rate of the heartbeat and strength of ventricular contractions?

What is the primary function of plasma in the blood?

Which of the following hormones increases the cardiac output?

What is the term for the cells suspended in the fluid matrix of blood?

Which nervous system decreases the rate of the heartbeat and speed of conduction of action potential?

What is the percentage of plasma in the blood volume?

What is the primary function of the circulatory system?

What is the difference between open and closed circulatory systems?

What is the role of the heart in the circulatory system?

What is the function of blood in the body?

What is the term for the fluid matrix of blood that contains various dissolved components?

What is the purpose of the excretory system in relation to the circulatory system?

What is the main function of chordae tendinae and papillary muscles?

What is the characteristic of arteries that carry oxygenated blood?

What is the function of capillaries in the circulatory system?

What is the type of circulation found in fish?

What is the outermost layer of arteries and veins?

What is the structure that guards the opening between the right atrium and right ventricle?

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