Advertisements
Advertisements
Question
Distinguish between open circulation and closed circulation.
Advertisements
Solution
| Open circulation | Closed circulation | ||
| 1. | In open circulation, blood is circulated through the body cavities (haemocoels). | 1. | In closed circulation, blood circulates the blood vessels and does not come in direct contact with cells and body tissues. |
| 2. | The blood flows with low pressure. | 2. | The blood flows with high pressure. |
| 3. | Exchange of material takes place directly between blood and cells or tissues of the body. | 3. | Exchange of material between blood and body tissues is through intermediate fluid called lymph. |
| 4. | It usually does not contain any respiratory pigment like haemoglobin so it does not transport respiratory gases | 4. | It contains respiratory pigments like haemoglobin for transportation of respiratory gases. |
| 5. | e.g. Arthropods and molluscs | 5. | e.g. All vertebrates, higher molluscs and annelids |
APPEARS IN
RELATED QUESTIONS
Why do we often sneeze when we inhale a lot of dust-laden air?
Answer briefly the following:
What is the difference between breathing and respiration?
Distinguish between inspiration and expiration.
When 1500 mL air is in the lungs, it is called ______.
Make the correct pairs.
| Column – I | Column – II |
| (P) Tidal volume | i. 1000 to 1100 ml |
| (Q) Residual volume | ii. 500 ml |
| (R) Expiratory reserve volume | iii. 2500 to 3000 ml |
| (S) Inspiratory reserve volume | iv. 1100 to 1200 ml |
Whenever we feel drowsy or sleepy, we start yawning. Does yawning help us in any way?
Assertion: During inhalation, the diaphragm goes downward.
Reason: The volume of the thoracic cavity decreases.
The partial pressures (in mm Hg) of oxygen (O2) and carbon dioxide (CO2) at alveoli (the site of diffusion) are ______
Mark the true statement among the following with reference to normal breathing.
In breathing movements, air volume can be estimated by ______.
