WGU D236 pathophysiology OA Questions and
Answers 2023/2024 | Complete Guide
GRADED A+
What is Starling's Law of Capillary forces?
How does this explain why a nutritionally deficient child would have
edema?
- ☑ ☑ Starling's Law describes how fluids move across the capillary
membrane. There are two major opposing forces that act to balance each
other, hydrostatic pressure (pushing water out of the capillaries) and
osmotic pressure (including oncontic pressure, which pushes fluid into
the capillaries).
Both electrolytes and proteins (oncontic pressure) in the blood affect
osmotic pressure, high electrolyte and protein concentrations in the blood
would cause water to leave the cells and interstitial space and enter the
blood stream to dilute the high concentrations.
.
,On, the other hand, low electrolyte and protein concentrations (as seen in
a nutritionally deficient child) would cause water to leave the capillaries
and enter the cells and interstitial fluid which can lead to edema.
How does the RAAS (Renin-Angiotensin-Aldosterone System) result in
increased blood volume and increased blood pressure?
- ☑ ☑ A drop in blood pressure is sensed by the kidneys by low
perfusion, which in turn begins to secrete renin.
, Renin then triggers the liver to produce angiotensinogen, which is
converted to Angiotensin I in the lungs and then angiotensin II by the
enzyme
Angiotensin-converting enzyme (ACE). Angiotensin II stimulates peripheral
arterial vasoconstriction which raises BP.
Angiotensin II is also stimulating the adrenal gland to release aldosterone,
which acts to increase sodium and water reabsorption increasing blood
volume, while also increased potassium secretion in urine.
How can hyperkalemia lead to cardiac arrest?
- ☑ ☑ Normal levels of potassium are between 3.5 and 5.2 mEq/dL.
Hyperkalemia refers to potassium levels higher that 5.2 mEq/dL.
A major function of potassium is to conduct nerve impulses in muscles. Too
low and muscle weakness occurs and too much can cause muscle spasms.
This is especially dangerous in the heart muscle and an irregular heartbeat can
cause a heart attack
.
, The body uses the Protein Buffering System, Phosphate Buffering System,
and Carbonic AcidBicarbonate System to regulate and maintain
homeostatic pH, what is the consequence of a pH imbalance
- ☑ ☑ Proteins contain many acidic and basic group that can be affected
by pH changes. Any increase or decrease in blood pH can alter the
structure of the protein (denature), thereby affecting its function as well
Describe the laboratory findings associated with metabolic acidosis,
metabolic alkalosis, respiratory acidosis and respiratory alkalosis. (ie
relative pH and CO2 levels).
- ☑ ☑ Normal ABGs (Arterial Blood Gases) Blood pH: 7.35-7.45 PCO2: 35-
45 mm Hg PO2: 90-100 mm Hg HCO3-: 22-26 mEq/L SaO2: 95-100%
Respiratory acidosis and alkalosis are marked by changes in PCO2. Higher
= acidosis and lower = alkalosis
Metabolic acidosis and alkalosis are caused by something other than
abnormal CO2 levels. This could include toxicity, diabetes, renal failure or
excessive GI losses.
Here are the rules to follow to determine if is respiratory or metabolic in
nature. -If pH and PCO2 are moving in opposite directions, then it is the
pCO2 levels that are causing the imbalance and it is respiratory in nature.
Answers 2023/2024 | Complete Guide
GRADED A+
What is Starling's Law of Capillary forces?
How does this explain why a nutritionally deficient child would have
edema?
- ☑ ☑ Starling's Law describes how fluids move across the capillary
membrane. There are two major opposing forces that act to balance each
other, hydrostatic pressure (pushing water out of the capillaries) and
osmotic pressure (including oncontic pressure, which pushes fluid into
the capillaries).
Both electrolytes and proteins (oncontic pressure) in the blood affect
osmotic pressure, high electrolyte and protein concentrations in the blood
would cause water to leave the cells and interstitial space and enter the
blood stream to dilute the high concentrations.
.
,On, the other hand, low electrolyte and protein concentrations (as seen in
a nutritionally deficient child) would cause water to leave the capillaries
and enter the cells and interstitial fluid which can lead to edema.
How does the RAAS (Renin-Angiotensin-Aldosterone System) result in
increased blood volume and increased blood pressure?
- ☑ ☑ A drop in blood pressure is sensed by the kidneys by low
perfusion, which in turn begins to secrete renin.
, Renin then triggers the liver to produce angiotensinogen, which is
converted to Angiotensin I in the lungs and then angiotensin II by the
enzyme
Angiotensin-converting enzyme (ACE). Angiotensin II stimulates peripheral
arterial vasoconstriction which raises BP.
Angiotensin II is also stimulating the adrenal gland to release aldosterone,
which acts to increase sodium and water reabsorption increasing blood
volume, while also increased potassium secretion in urine.
How can hyperkalemia lead to cardiac arrest?
- ☑ ☑ Normal levels of potassium are between 3.5 and 5.2 mEq/dL.
Hyperkalemia refers to potassium levels higher that 5.2 mEq/dL.
A major function of potassium is to conduct nerve impulses in muscles. Too
low and muscle weakness occurs and too much can cause muscle spasms.
This is especially dangerous in the heart muscle and an irregular heartbeat can
cause a heart attack
.
, The body uses the Protein Buffering System, Phosphate Buffering System,
and Carbonic AcidBicarbonate System to regulate and maintain
homeostatic pH, what is the consequence of a pH imbalance
- ☑ ☑ Proteins contain many acidic and basic group that can be affected
by pH changes. Any increase or decrease in blood pH can alter the
structure of the protein (denature), thereby affecting its function as well
Describe the laboratory findings associated with metabolic acidosis,
metabolic alkalosis, respiratory acidosis and respiratory alkalosis. (ie
relative pH and CO2 levels).
- ☑ ☑ Normal ABGs (Arterial Blood Gases) Blood pH: 7.35-7.45 PCO2: 35-
45 mm Hg PO2: 90-100 mm Hg HCO3-: 22-26 mEq/L SaO2: 95-100%
Respiratory acidosis and alkalosis are marked by changes in PCO2. Higher
= acidosis and lower = alkalosis
Metabolic acidosis and alkalosis are caused by something other than
abnormal CO2 levels. This could include toxicity, diabetes, renal failure or
excessive GI losses.
Here are the rules to follow to determine if is respiratory or metabolic in
nature. -If pH and PCO2 are moving in opposite directions, then it is the
pCO2 levels that are causing the imbalance and it is respiratory in nature.
