Animal Tissues

Step 1: Understanding the Relationship Between Tissues and Cancer Types

Different types of cancers originate from different tissues. Understanding this helps in matching them correctly.
Step 2: Matching the Pairs

- Epithelial tissues are associated with Carcinoma (II), a cancer of epithelial cells.
- Connective tissues are associated with Sarcoma (IV), a cancer affecting bones, cartilage, and connective tissues.
- Bone marrow is linked to Leukemia (I), a blood cancer originating in bone marrow.
- Non-hereditary cancers refer to Sporadic cancer (III), which occurs due to environmental or lifestyle factors rather than genetic inheritance.
Step 3: Conclusion

Thus, the correct matching is:
- A → II
- B → IV
- C → I
- D → III

Step 1: Understanding ECG Intervals:
The P-R interval represents the time taken for the electrical impulse to travel from the SA node through the atria, AV node, and His-Purkinje system to the ventricles. The normal duration is 0.12 to 0.20 seconds.
Step 2: Analyzing "Prolonged" P-R Interval:
A P-R interval greater than 0.20 seconds indicates a delay in conduction, primarily at the AV node. This condition is called First-degree AV block. This delay typically results in a slower heart rate or is associated with conditions causing a slow heart rate, known as Bradycardia.
Step 3: Analyzing Other Options:
(B) Tachycardia: Fast heart rate (usually shortens intervals).
(C) Hypokalemia: Causes flattening of T waves and appearance of U waves.
(D) Hypercalcemia: Causes shortening of the QT interval.
Step 4: Final Answer:
Prolonged P-R interval is most closely associated with Bradycardia (slowing of the heart) in the context of conduction blocks.

• Tall, peaked T-waves on ECG are a classic sign of hyperkalemia (elevated serum potassium).
• Hypokalemia produces flattened or inverted T-waves and U-waves.
• Therefore the correct answer is (1) Hyperkalemia.

Alpha waves (8–13 Hz) are recorded in relaxed, awake adults with eyes closed. Beta waves → alert thinking; Delta → deep sleep; Theta → drowsy/light sleep.