Advertisements
Advertisements
प्रश्न
Write the differences between open and closed system of circulation
Advertisements
उत्तर
| Open system of circulation | Closed system of circulation | |
| 1. | Blood flow via the sinuses' exposed tissue spaces. | Blood flows through blood vessels, which are closed tubes with a distinct wall. |
| 2. | Blood and tissue cells come into intimate contact. | Tissue cells are not in direct contact with the blood. |
| 3. | Direct material exchange takes place between tissue cells and blood cells. | Tissue fluid facilitates the exchange of materials between blood and tissue cells. |
| 4. | There is virtually little blood flow. | The blow flow is really quick. |
| 5. | There are no red corpuscles and any respiratory pigment that may be present dissolves in the plasma. | Although respiratory pigment is present and has the potential to disintegrate in plasma, it is typically retained in red blood cells. |
| 6. | Occur in most molluscs and arthropods. | Occur in vertebrates and annelids. |
APPEARS IN
संबंधित प्रश्न
Describe the evolutionary change in the pattern of heart among the vertebrates.
Sino-atrial node is called the pacemaker of our heart. Why?
A patient’s chart reveals that he has a cardiac output of 7500 mL per minute and a stroke volume of 50 mL. What is his pulse rate (in beats/min)
Distinguish between mitral valve and semi lunar valve.
Right ventricular wall is thinner than the left ventricular wall. Why?
What are the heart sounds? When and how are these sounds produced?
Select the correct biological term.
The substances which gives red cells their colour.
The cardiac impulse is initiated and conducted further upto ventricle. The correct sequence of conduction of impulse is ______.
Read the following statements and choose the correct option
Statement 1: Atria receive blood from all parts of the body which subsequently flows to ventricles.
Statement 2: Action potential generated at sino-atrial node passes from atria to ventricles.
Define the following terms and give their location?
Purkinje fibre
Write the features that distinguish between the two.
Sino-atrial node and Atrio-ventricular node
Answer the following:
Which part of heart is responsible for initating and maintaining its rhythmic activity?
In the diagrammatic presentation of heart given below, mark and label, SAN, AVN, AV bundles, bundle of His and Purkinje fibres.
Cardiac activities of the heart are regulated by ______.
- Nodal tissue
- A special neural centre in the medulla oblongata
- Adrenal medullary hormones
- Adrenal cortical hormones
Choose the correct answer from the options given below:
Following are the stages of pathway for conduction of an action potential through the heart:
- AV bundle
- Purkinje fibres
- AV node
- Bundle branches
- SA node
Choose the correct sequence of pathway from the options given below:
