A&P II Cardiac Output and Blood Pressure
40 flashcards covering A&P II Cardiac Output and Blood Pressure for the ANATOMY-PHYSIOLOGY-2 A&P II Systems section.
Cardiac output and blood pressure are fundamental concepts in understanding the cardiovascular system's function and regulation. Cardiac output refers to the volume of blood the heart pumps per minute, while blood pressure is the force exerted by circulating blood on the walls of blood vessels. These concepts are defined in the Anatomy and Physiology II curriculum, which emphasizes their importance in maintaining homeostasis and responding to physiological demands.
On practice exams and competency assessments, questions on cardiac output and blood pressure often involve calculations, such as determining cardiac output using heart rate and stroke volume. Common traps include miscalculating or confusing the units of measurement and overlooking the factors that influence both cardiac output and blood pressure, such as vascular resistance and blood volume. A frequent oversight among clinicians is neglecting to assess the patient's overall fluid status, which can significantly impact both cardiac output and blood pressure management.
Terms (40)
- 01
What is cardiac output?
Cardiac output is the volume of blood the heart pumps per minute, calculated as heart rate multiplied by stroke volume (Marieb, Anatomy and Physiology).
- 02
How is stroke volume defined?
Stroke volume is the amount of blood ejected by the left ventricle during each contraction (Marieb, Anatomy and Physiology).
- 03
What factors influence cardiac output?
Cardiac output is influenced by heart rate, stroke volume, and the body's demand for oxygen (Marieb, Anatomy and Physiology).
- 04
What is the average resting heart rate for adults?
The average resting heart rate for adults is typically between 60 to 100 beats per minute (Marieb, Anatomy and Physiology).
- 05
How is blood pressure defined?
Blood pressure is the force exerted by circulating blood on the walls of blood vessels, measured in mmHg (Marieb, Anatomy and Physiology).
- 06
What is the normal range for systolic blood pressure?
Normal systolic blood pressure is generally considered to be between 90 and 120 mmHg (Marieb, Anatomy and Physiology).
- 07
What is the normal range for diastolic blood pressure?
Normal diastolic blood pressure is typically between 60 and 80 mmHg (Marieb, Anatomy and Physiology).
- 08
How often should blood pressure be monitored in adults?
Blood pressure should be monitored at least once every two years for adults with normal readings (Marieb, Anatomy and Physiology).
- 09
What is the relationship between cardiac output and blood pressure?
Cardiac output and blood pressure are directly related; an increase in cardiac output typically raises blood pressure (Marieb, Anatomy and Physiology).
- 10
What is the formula for calculating cardiac output?
Cardiac output is calculated using the formula: CO = HR x SV, where CO is cardiac output, HR is heart rate, and SV is stroke volume (Marieb, Anatomy and Physiology).
- 11
What role does the autonomic nervous system play in regulating heart rate?
The autonomic nervous system regulates heart rate through sympathetic (increases heart rate) and parasympathetic (decreases heart rate) pathways (Marieb, Anatomy and Physiology).
- 12
What is the effect of increased physical activity on cardiac output?
Increased physical activity raises cardiac output to meet the higher oxygen demands of the body (Marieb, Anatomy and Physiology).
- 13
What is meant by mean arterial pressure (MAP)?
Mean arterial pressure is the average blood pressure in a person's arteries during one cardiac cycle, calculated as MAP = DBP + 1/3(SBP-DBP) (Marieb, Anatomy and Physiology).
- 14
What is the significance of pulse pressure?
Pulse pressure is the difference between systolic and diastolic blood pressure and indicates the health of the arterial system (Marieb, Anatomy and Physiology).
- 15
How does dehydration affect blood pressure?
Dehydration can lead to decreased blood volume, resulting in lower blood pressure (Marieb, Anatomy and Physiology).
- 16
What is the impact of hypertension on cardiac output?
Hypertension can lead to increased workload on the heart, potentially resulting in decreased cardiac output over time (Marieb, Anatomy and Physiology).
- 17
What is the first step in assessing a patient's blood pressure?
The first step in assessing blood pressure is to ensure the patient is seated comfortably and relaxed for at least five minutes (Marieb, Anatomy and Physiology).
- 18
What is a common method for measuring blood pressure?
A common method for measuring blood pressure is using a sphygmomanometer and a stethoscope (Marieb, Anatomy and Physiology).
- 19
When should a patient be referred for further evaluation of blood pressure?
A patient should be referred for further evaluation if their blood pressure readings are consistently above 140/90 mmHg (Marieb, Anatomy and Physiology).
- 20
What physiological changes occur during exercise that affect cardiac output?
During exercise, heart rate and stroke volume increase, leading to a higher cardiac output to supply muscles with oxygen (Marieb, Anatomy and Physiology).
- 21
What is the effect of vasodilation on blood pressure?
Vasodilation decreases peripheral resistance, which can lower blood pressure (Marieb, Anatomy and Physiology).
- 22
How does the body respond to low blood pressure?
In response to low blood pressure, the body activates the renin-angiotensin-aldosterone system to increase blood volume and pressure (Marieb, Anatomy and Physiology).
- 23
What is the role of baroreceptors in blood pressure regulation?
Baroreceptors detect changes in blood pressure and send signals to the central nervous system to adjust heart rate and vessel diameter (Marieb, Anatomy and Physiology).
- 24
What is the expected change in cardiac output during stress?
During stress, cardiac output typically increases due to elevated heart rate and contractility (Marieb, Anatomy and Physiology).
- 25
What is a hypertensive crisis?
A hypertensive crisis is defined as a severe increase in blood pressure that can lead to organ damage, usually above 180/120 mmHg (Marieb, Anatomy and Physiology).
- 26
What lifestyle modifications can help manage high blood pressure?
Lifestyle modifications include maintaining a healthy diet, regular physical activity, reducing sodium intake, and managing stress (Marieb, Anatomy and Physiology).
- 27
What is the significance of cardiac reserve?
Cardiac reserve is the difference between resting cardiac output and maximum cardiac output, indicating the heart's ability to respond to increased demands (Marieb, Anatomy and Physiology).
- 28
How does age affect blood pressure?
As individuals age, blood pressure often increases due to arterial stiffness and other factors (Marieb, Anatomy and Physiology).
- 29
What is the relationship between blood volume and blood pressure?
Increased blood volume typically raises blood pressure, while decreased blood volume lowers it (Marieb, Anatomy and Physiology).
- 30
What is the role of the kidneys in blood pressure regulation?
The kidneys help regulate blood pressure by controlling blood volume through fluid balance and electrolyte management (Marieb, Anatomy and Physiology).
- 31
What is orthostatic hypotension?
Orthostatic hypotension is a form of low blood pressure that occurs when standing up from sitting or lying down, causing dizziness or fainting (Marieb, Anatomy and Physiology).
- 32
What is the impact of smoking on blood pressure?
Smoking can lead to increased blood pressure and heart rate, contributing to cardiovascular disease (Marieb, Anatomy and Physiology).
- 33
How does the body compensate for high blood pressure?
The body compensates for high blood pressure by increasing renal excretion of sodium and water, reducing blood volume (Marieb, Anatomy and Physiology).
- 34
What is the role of nitric oxide in blood pressure regulation?
Nitric oxide is a vasodilator that helps lower blood pressure by relaxing blood vessel walls (Marieb, Anatomy and Physiology).
- 35
What is the importance of monitoring blood pressure in pregnancy?
Monitoring blood pressure in pregnancy is crucial to detect conditions like preeclampsia, which can affect maternal and fetal health (Marieb, Anatomy and Physiology).
- 36
What is the effect of high salt intake on blood pressure?
High salt intake can lead to increased blood volume and elevated blood pressure (Marieb, Anatomy and Physiology).
- 37
What is the role of the heart's pacemaker cells?
Pacemaker cells in the sinoatrial node initiate electrical impulses that regulate heart rate (Marieb, Anatomy and Physiology).
- 38
How does exercise training affect blood pressure?
Regular exercise training can lead to lower resting blood pressure and improved cardiovascular health (Marieb, Anatomy and Physiology).
- 39
What is the significance of the Frank-Starling law of the heart?
The Frank-Starling law states that the more the heart muscle is stretched (up to a point), the stronger the contraction, affecting stroke volume (Marieb, Anatomy and Physiology).
- 40
What is the effect of caffeine on blood pressure?
Caffeine can temporarily raise blood pressure by increasing heart rate and causing vasoconstriction (Marieb, Anatomy and Physiology).