📝 Step 6 — KMU Past Papers & Exam Learning
This section contains KMU-style past paper questions designed to strengthen conceptual understanding. Focus on understanding explanations rather than memorizing answers.
🎯 How to Study KMU Past Papers
- Read the question carefully.
- Think about the answer before looking.
- Read the explanation slowly.
- Understand the reasoning behind the correct answer.
- Revise difficult questions again.
MCQ 1
Question:
A small artery constricts slightly during sympathetic stimulation. Which hemodynamic change will most strongly reduce tissue blood flow?
Options:
Increase in vessel length
Increase in blood viscosity
Decrease in vessel radius
Decrease in pulse pressure
Increase in venous pressure
Correct Answer:
Decrease in vessel radius
Explanation:
According to Poiseuille’s law, flow is proportional to the fourth power of radius, so even a small decrease in radius markedly increases resistance and reduces flow.
MCQ 2
Question:
A patient develops marked swelling of both ankles due to right-sided heart failure. Which Starling force is primarily increased?
Options:
Plasma oncotic pressure
Capillary hydrostatic pressure
Interstitial hydrostatic pressure
Lymphatic pumping pressure
Capillary osmotic gradient
Correct Answer:
Capillary hydrostatic pressure
Explanation:
Right-sided heart failure increases venous pressure, which raises capillary hydrostatic pressure and promotes filtration into tissues.
MCQ 3
Question:
A histology slide shows capillaries with tight endothelial junctions and a continuous basement membrane. Which site is most likely represented?
Options:
Liver sinusoids
Skeletal muscle
Bone marrow
Splenic pulp
Adrenal cortex
Correct Answer:
Skeletal muscle
Explanation:
Continuous capillaries with tight endothelial junctions are found in muscle, skin, lungs, and brain, allowing controlled exchange.
MCQ 4
Question:
During exercise, active skeletal muscle receives increased blood flow despite generalized sympathetic activity. What best explains this response?
Options:
Venous valve opening
Plasma protein retention
Local metabolic vasodilation
Lymphatic flow reduction
Capillary wall thickening
Correct Answer:
Local metabolic vasodilation
Explanation:
Active muscle releases metabolites such as CO₂, H⁺, K⁺, lactate, and adenosine, which override sympathetic vasoconstriction locally.
MCQ 5
Question:
A decrease in plasma albumin concentration is most likely to cause edema by reducing:
Options:
Interstitial pressure
Capillary permeability
Arteriolar resistance
Plasma oncotic pressure
Lymphatic valve function
Correct Answer:
Plasma oncotic pressure
Explanation:
Albumin generates most plasma oncotic pressure. Reduced albumin lowers reabsorption of fluid into capillaries and promotes edema.
MCQ 6
Question:
A tissue maintains near-normal blood flow despite moderate rise in arterial pressure. Which mechanism is mainly responsible?
Options:
Myogenic autoregulation
Reduced venous return
Increased plasma viscosity
Lymphatic obstruction
Capillary filtration
Correct Answer:
Myogenic autoregulation
Explanation:
Increased stretch of arteriolar smooth muscle causes contraction, increasing resistance and maintaining relatively constant flow.
MCQ 7
Question:
In inflammation, local swelling occurs because histamine mainly causes:
Options:
Reduced plasma protein synthesis
Increased endothelial permeability
Increased arterial compliance
Reduced interstitial oncotic pressure
Increased lymphatic obstruction
Correct Answer:
Increased endothelial permeability
Explanation:
Histamine increases capillary permeability, allowing proteins to enter interstitial fluid and draw water into tissues.
MCQ 8
Question:
Which capillary type best allows passage of large plasma proteins into surrounding tissue?
Options:
Continuous capillary
Fenestrated capillary
Sinusoidal capillary
Metarteriole
Venous sinus
Correct Answer:
Sinusoidal capillary
Explanation:
Sinusoidal capillaries have large endothelial gaps and discontinuous basement membrane, allowing passage of large molecules and cells.
MCQ 9
Question:
A tissue with high metabolic activity produces adenosine. Which vascular response is expected?
Options:
Arteriolar dilation
Venular closure
Capillary collapse
Lymphatic constriction
Plasma protein leakage
Correct Answer:
Arteriolar dilation
Explanation:
Adenosine is a local metabolic vasodilator that relaxes arteriolar smooth muscle and increases blood flow to active tissues.
MCQ 10
Question:
Which change will most directly increase lymph flow from an edematous limb?
Options:
Reduced tissue pressure
Increased skeletal muscle activity
Decreased venous valve closure
Reduced interstitial protein content
Increased plasma oncotic pressure
Correct Answer:
Increased skeletal muscle activity
Explanation:
Muscle contraction compresses lymphatic vessels, and one-way valves promote forward lymph flow toward venous circulation.
MCQ 11
Question:
A capillary bed in the renal glomerulus is specialized for rapid filtration. Which histological feature supports this function?
Options:
Thick smooth muscle coat
Fenestrated endothelium
Stratified epithelial lining
Complete elastic lamina
Dense collagen capsule
Correct Answer:
Fenestrated endothelium
Explanation:
Fenestrations increase permeability and permit rapid filtration, especially in kidneys and endocrine organs.
MCQ 12
Question:
During dynamic exercise, blood flow to the gastrointestinal tract commonly decreases because of:
Options:
Local metabolic relaxation
Sympathetic vasoconstriction
Reduced cardiac output
Increased capillary density
Loss of basal tone
Correct Answer:
Sympathetic vasoconstriction
Explanation:
Exercise redistributes blood toward skeletal muscle and heart; splanchnic blood flow falls due to sympathetic vasoconstriction.
MCQ 13
Question:
A patient has lymphatic obstruction after surgical removal of lymph nodes. Which type of edema is most likely?
Options:
Low-protein transudate
Protein-rich interstitial swelling
Pure intracellular fluid retention
Reduced capillary filtration
Increased plasma volume only
Correct Answer:
Protein-rich interstitial swelling
Explanation:
Lymphatics normally remove interstitial proteins. Obstruction causes protein accumulation, which attracts fluid and produces persistent edema.
MCQ 14
Question:
Which statement best explains basal vascular tone?
Options:
Complete relaxation of veins
Continuous partial contraction of vascular smooth muscle
Intermittent closure of capillary pores
Passive recoil of endothelial cells
Rhythmic opening of lymphatic valves
Correct Answer:
Continuous partial contraction of vascular smooth muscle
Explanation:
Basal tone is the resting partial contraction of vascular smooth muscle, allowing vessels to either constrict or dilate as needed.
MCQ 15
Question:
A fall in tissue oxygen tension increases local blood flow mainly by:
Options:
Increasing venous pressure
Reducing lymphatic drainage
Promoting arteriolar relaxation
Increasing plasma oncotic pressure
Thickening capillary basement membrane
Correct Answer:
Promoting arteriolar relaxation
Explanation:
Low oxygen and accumulated metabolites relax arteriolar smooth muscle, reducing resistance and improving tissue perfusion.
MCQ 16
Question:
A patient with severe burns develops generalized swelling. The main mechanism is:
Options:
Reduced vessel length
Increased capillary permeability
Increased plasma albumin
Reduced tissue metabolism
Increased arterial resistance
Correct Answer:
Increased capillary permeability
Explanation:
Burns damage capillary endothelium, allowing fluid and proteins to escape into tissues and produce edema.
MCQ 17
Question:
Which organ maintains relatively constant blood flow during moderate exercise?
Options:
Skin
Liver
Brain
Kidney
Intestine
Correct Answer:
Brain
Explanation:
Cerebral blood flow remains relatively constant because of strong autoregulation, despite redistribution of blood during exercise.
MCQ 18
Question:
A rise in interstitial fluid pressure initially affects lymphatic capillaries by:
Options:
Opening endothelial flaps
Closing venous valves
Increasing arterial tone
Reducing capillary filtration
Lowering plasma oncotic pressure
Correct Answer:
Opening endothelial flaps
Explanation:
Lymphatic capillaries have overlapping endothelial cells that open when interstitial pressure rises, allowing fluid entry.
MCQ 19
Question:
Which endothelial product is a major physiological vasodilator?
Options:
Endothelin
Nitric oxide
Angiotensin II
Norepinephrine
Vasopressin
Correct Answer:
Nitric oxide
Explanation:
Nitric oxide is released by endothelial cells and relaxes vascular smooth muscle, producing vasodilation.
MCQ 20
Question:
A student compares two vessels of equal length and pressure gradient. Vessel X has double the radius of vessel Y. Flow in vessel X will be approximately:
Options:
Two times greater
Four times greater
Eight times greater
Sixteen times greater
Thirty-two times greater
Correct Answer:
Sixteen times greater
Explanation:
Poiseuille’s law states that flow is proportional to radius⁴; doubling the radius increases flow by 2⁴, which equals 16 times.
📌 Important Exam Strategy
KMU examinations often test integrated understanding rather than isolated facts. Focus on linking anatomy, embryology, histology, and clinical concepts when reviewing questions.
✅ Revision Tip
If you can explain the reason behind the correct answer without looking at notes, your concept is strong.