CBSE Questions for Class 11 Medical Biology Body Fluids And Circulation Quiz 5 - MCQExams.com

• Lymph acts as middle man which transports food materials, oxygen, hormones etc. to the body cells and brings carbon dioxide and other metabolic wastes from the body cells to blood when it pours the same into venous system.
  
• Lymph differs from blood as it is composed of only WBC. 
• Lymph is the fluid, which forms an integral part of the lymphatic system. 
• It is formed when the interstitial fluid is collected through lymph capillaries. 
• It is then transported through lymph vessels to lymph nodes before emptying ultimately into the right or the left subclavian vein, where it mixes back with blood.

• Structure absent from fresh frozen blood plasma are platelets. Platelets have no nucleus: they are fragments of cytoplasm which are derived from the megakaryocytes. 
• The main function of platelets is to contribute to hemostasis and to stop bleeding at the site of interrupted endothelium. They gather at the site and unless the interruption is physically too large, they plug the hole.
•  In the fresh frozen blood plasma, there will be an absence of blood cells. So, in frozen plasma platelets are also absent.

• Peyer's patches are located in the ileum of small intestine. They are masses of lymphatic tissue. 
• Their function is to produce lymphocytes which prevent the growth of bacterial populations inside the body. 
• Hence the correct option is B.

1. Sahli's method
2. Cyanmet Hb method
3. Hemoglobinometer
   
4. Haden Hausser method

• Humans have double circulation. The blood pumped by the right ventricle enters the pulmonary artery, whereas the left ventricle pumps blood into the aorta.
• The deoxygenated blood pumped into the pulmonary artery is passed onto the lungs from where the oxygenated blood is carried by the pulmonary veins into the left atrium.
• This pathway constitutes the pulmonary circulation.
• The oxygenated blood entering the aorta is carried by a network of arteries, arterioles, and capillaries to the tissues from where the deoxygenated blood is collected by a system of venules, veins, and vena cava and emptied into the right atrium. This is the systemic circulation. 
  Hence, the correct option is C.

Solution:

• Correct answer is option B

• The circulatory patterns are of two types open or closed. 
• An open circulatory system is a type of circulatory system in which blood pumped by the heart passes through large vessels into open spaces or body cavities, called as sinuses. It is common in arthropods and molluscs. 

• Cockroach, Mosquito, and Housefly have open circulatory system.

• An open circulatory system is present in members of phylum Arthropoda and Mollusca in which blood is pumped by the heart passes through large vessels into open spaces or body cavities called sinuses. 
• Annelids and chordates have a closed circulatory system in which the blood pumped by the heart is always circulated through a closed network of blood vessels.

• The open circulatory system is present in arthropods and molluscs in which blood pumped by the heart passes through large vessels into open spaces or body cavities called sinuses. 
• Chordates have a closed circulatory system in which the blood pumped by the heart is always circulated through a closed network of blood vessels. This type is considered to be more advantageous as the flow of fluid can be more precisely regulated.
  
• So, the correct answer is 'Arthropods'.

$$\textbf{Correct answer: D}$$  

$$\textbf{Option (A):}$$  

$$\bullet$$ The systolic pressure over diastolic pressure is 90/60. Systolic pressure here is 90 while the diastolic pressure is 60.

$$\bullet$$ The normal blood pressure is about 120/80 and this is lesser than that pressure. A person having such systolic and diastolic pressure must be suffering from low pressure.

$$\textbf{Option (B):}$$  

$$\bullet$$ Only the diastolic pressure is a bit higher when the blood pressure is 120/85.

$$\bullet$$ This can occur even in normal humans and can never be considered as hypertension.

$$\textbf{Option (C):}$$  

$$\bullet$$ A person is suffering from low pressure conditions if they have a blood pressure of 110/70.

$$\bullet$$ Both their systolic and diastolic pressure are equally low in this case as compared to normal.

$$\textbf{Option (D):}$$  

$$\bullet$$ A blood pressure of 140/100 can be considered a high pressure.

$$\bullet$$ Both the systolic pressure and the diastolic pressure are higher than normal. This shows the condition of high blood pressure which can be considered as hypertension in a patient.

Hence, the correct answer is option (D).