PAT 201 - WEEK 6 | Questions with 100% Verified Answers | Latest Update 2026/2027

PAT 201 - WEEK 6 | Questions with 100% Verified Answers |
Latest Update 2026/2027
Question: What are body fluids divided into?
Answer: Fluid compartments

Question: How many Fluid Compartments are
there? What are they?
Answer: 2 Fluid compartments:
1. Intracellular (ICF)
2. Extracellular (ECF)

Question: ICF Total Body Fluid
Answer: 2/3 total body fluid INSIDE the cells

Question: ECF Total Body Fluid
Answer: 1/3 total body fluid inside the OUTSIDE the cells

Question: What is ECF composed of?
Answer: Composed of plasma and ICF:
- interstitial fluid
- intravascular fluid
- cerebrospinal fluid (CSF)
- lymphatic, synovial, intestinal, biliary, hepatic,
pancreatic, pleural, peritoneal, pericardial, and
intraocular fluids
- sweat
- urine

Question: Distribution of Body Fluids?
Answer: Fluid moves continuously between ICF and ECF
compartments through semi-permeable cell
membranes

Question: Intracellular Fluid Compartment
Answer: - Cells: 25 L
- 40% of body weight

Question: Extracellular Fluid Compartment
Answer: - Interstitial Fluid: 12 L
- Plasma: 3 L
- 20% of body weight

Question: What separates the Cells and the
Interstitial fluid (ICF and ECF)
Answer: Plasma Membrane

,Question: What separates Interstitial fluid and
Plasma (ECF and ECF)
Answer: Capillary Membrane

Question: Total Body Water: Newborn
Answer: 70-80% of body weight

Question: Total Body Water: Childhood
Answer: 60-65% of body weight

Question: Total Body Water: Adults
Answer: 50-60% of body weight

Question: Total Body Water: Older Adults
Answer: Percent declines with age

Question: Who has greater percentage of
body water: Men or Women?
Answer: Men have greater percentage of body water
compared with women

Question: Who is at a higher risk for
dehydration? Why?
Answer: Newborns - do not concentrate urine as
effectively and have a high rate of metabolism;
high rate of evaporation; large body surface
area compared to their body volume; low
residual volume in lungs; not mature yet
Signs to watch for: sleepiness, sunken eyes, skin
turgor, less wet diapers

Question: Water Movement Between ICF and
ECF
Answer: - Osmolality
- Osmotic forces
- Sodium for ECF
- Potassium for ICF
- Aquaporins

Question: Aquaporins
Answer: A family of water channel proteins that provide
permeability to water

, Question: Factors Affecting Fluid &
Electrolyte Distribution
Answer: - Diffusion
- Active Transport
- Osmosis
- Filtration
- Reabsorption

Question: What is Diffusion?
Answer: PARTICLES move from HIGH --> LOW solute
conc.
- DIffusion = HIgh

Question: What is Osmosis?
Answer: WATER moves from LOW --> HIGH solute conc.
- OsMOsis = LOW

Question: Water Movement Between Plasma
and Interstitial Fluid
Answer: - Starling Hypothesis
- Forces FAVORING Filtration
- Forces OPPOSING Filtration

Question: Starling Hypothesis
Answer: Net filtration is equal to the forces favoring
filtration minus the forces opposing filtration

Question: What does "Starling Forces" mean?
Answer: The physical forces that determine the
movement of fluid between capillaries and
tissue fluid

Question: Starling Forces: Forces FAVORING
Filtration
Answer: 1. Capillary Hydrostatic Pressure (BP)
2. Interstitial Oncotic Pressure (water pulling)

Question: Starling Forces: Forces OPPOSING
Filtration
Answer: 1. Capillary (plasma) Oncotic Pressure (water
pulling)
2. Interstitial Hydrostatic Pressure