Home
Class 12
BIOLOGY
[A]: A portal system is a complex of vei...

[A]: A portal system is a complex of veins which begins in capillaries and ends in capil- laries before the blood which courses through it is retruned to the heart.
[R]: All vertebrates have a hepatic portal sys-tem.

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).

C

If Assertion is true statement but Reason is false, then mark (3).

D

If both Assertion and Reason are false statements, then mark (4).

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • BODY FLUIDS AND CIRCULATION

    AAKASH INSTITUTE ENGLISH|Exercise Assignment Section - C Previous Year Questions|69 Videos

  • BIOTECHNOLOGY-PRINCIPLES AND PROCESSES

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION-D (Assertion-Reason Type Question)|10 Videos

  • BREATHING AND EXCHANGE OF GASES

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION - D|11 Videos

Similar Questions

Explore conceptually related problems

A : Portal system consists of veins which start from capillaries and end into capillaries. R : All vertebrates have hepatic portal system.

Assertion : Portal system consists of veins which start from capillaries and end into capillaries. Reason : The hepatic portal vein carries blood from intestine to liver before it is delivered to the systemic circulation.

In human kidney, the blood vessel which is not a portal vein but starts with blood capillaries and end with blood capillaries is

Vein not blonging to digestive tract which becomes component part of hepatic portal system of Frog is

The hepatic portal vein carries blood from A to B before it is delivered to systemic circulation. Choose the option which gives the correct description for A and B ?

Go through the following statements . (i) Hypophysial portal vein carries blood from the hypothalamus to the anterior lobe of the pituitary gland. (ii) The central nervous system lacks lymphatic channels. (ii) The thoracic duct drains into the left subclavian vein. (iv) Hepatic portal vein is formed by the union of superior mesenteric vein and splenic vein. Which of these are correct ?

Blood vessels through which systemic circulation begins from heart and terminates in heart are A and B respectively. Name the blood vessels A and B

The human ciculatory system can be thought of as a closed system of interconnecting pipes through which fluid is continuously circulated by two pumps the two pumps the right and left verticles of the heart, work as simple two-stroke force pumps. The muscles of the heart regulate the force by contracting and relaxing. the contraction (systole) lasts about 0.2s and a complete systole/diastole (contraction/relaxation) cycle lasts about 0.8s. For flood pressures and speeds in the normal range. the volume flow rate of blood through a blood vessel is directly proportional tot he pressure difference over a length of the vessel and to the fourth power of the radius of the vessel. The total mechanical energy per unit volume of blood just as it leaves the heart is E//V=rhogh+P+rhov^(2) Q. The blood pressure in a capillary bed is essentially zero, allowing blood to flow extremely slowly through the tissues in order to maximize exhange of gases nutrients and waste products what is the work on 200cm^(3) of blood against gravity to bring it to the capillaries to the brain 50 cm above the heart?