‘Heart’ is related to ‘Circulation’ in the same way as ‘Kidney’ is related to ‘________’.
Excretion
Understanding the Organ-Process Analogy
The question presents an analogy: ‘Heart’ is related to ‘Circulation’ in the same way as ‘Kidney’ is related to something else. To solve this, we need to understand the relationship between the first pair of words and apply the same relationship to the second pair.
Let's analyze the relationship between ‘Heart’ and ‘Circulation’:
- The Heart is the central organ of the circulatory system.
- Its primary function is to pump blood throughout the body, which is the core process of Circulation.
- So, the relationship is that the first word (Organ) is primarily responsible for the process described by the second word (Process).
Now, we need to find which of the given options represents a process for which the Kidney is primarily responsible.
| Option | Description | Relationship to Kidney |
|---|---|---|
| 1. Reproduction | The biological process of producing new individual organisms. | Kidneys are not primarily involved in reproduction. Organs like ovaries, testes, uterus, etc., are involved. |
| 2. Respiration | The process of breathing (taking in oxygen and releasing carbon dioxide) and cellular energy release. | Kidneys are not primarily involved in respiration. Organs like lungs are primarily involved in breathing. |
| 3. Energy Production | The cellular process of converting nutrients into energy (ATP). | Energy production happens at the cellular level in mitochondria throughout the body. Kidneys require energy but are not the primary organs for its production for the entire body. |
| 4. Excretion | The process of eliminating metabolic waste products, excess salts, and water from the body. | Kidneys are the principal organs responsible for filtering blood and producing urine, which is the main way the body excretes nitrogenous waste and regulates fluid balance. This is their primary function related to excretion. |
Applying the same relationship ("Organ is responsible for the Process") as in "Heart is related to Circulation", we find that the Kidney is primarily responsible for the process of Excretion.
Therefore, the correct analogy is ‘Heart’ is related to ‘Circulation’ in the same way as ‘Kidney’ is related to ‘Excretion’.
Revision Table: Key Biological Processes
| Process | Primary Organs Involved | Function Summary |
|---|---|---|
| Circulation | Heart, Blood Vessels | Transporting blood (containing oxygen, nutrients, hormones, waste) throughout the body. |
| Excretion | Kidneys, Ureters, Bladder, Urethra (also Lungs for $\text{CO}_2$, Skin for sweat) | Eliminating waste products from the body, maintaining fluid and electrolyte balance. Kidneys filter blood to produce urine. |
| Reproduction | Ovaries, Testes, Uterus, etc. | Producing offspring. |
| Respiration | Lungs, Trachea, Diaphragm | Gas exchange (oxygen intake, carbon dioxide removal) and cellular energy release. |
Additional Information: The Role of Kidneys in Excretion
The kidneys are vital organs located on either side of the spine below the ribs. Their main functions include:
- Filtering blood: Removing waste products from metabolism (like urea from protein breakdown) and excess substances from the blood.
- Producing urine: Concentrating waste products and excess water into urine.
- Regulating fluid balance: Controlling the amount of water in the body.
- Regulating electrolyte balance: Controlling levels of salts like sodium, potassium, and calcium.
- Regulating blood pressure: Producing enzymes and hormones that help manage blood pressure.
While other organs contribute to excretion (e.g., lungs remove carbon dioxide, skin removes sweat), the kidneys are the principal organs for removing nitrogenous waste and regulating blood composition, making them central to the process of excretion.
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