Circulatory System in Frogs MCQ - Practice Questions with Answers

 Circulatory System in Frogs

Blood Vascular System

• The vascular system of frog is well-developed closed type. 
• The blood vascular system involves heart, blood vessels and blood. 
• Heart is a muscular structure situated in the upper part of the body cavity. 
• It has three chambers, two atria and one ventricle and is covered by a membrane called the pericardium. 
• A triangular structure called sinus venosus joins the right atrium. It receives blood through the major veins called the vena cava.
• The ventricle opens into a sac-like conus arteriosus on the ventral side of the heart.
• The blood from the heart is carried to all parts of the body by the arteries (arterial system).
• The veins collect blood from different parts of the body to the heart and form the venous system
• Special venous connection between liver and intestine  is called hepatic portal system is present in frogs. 
• Special venous connection between kidney and lower parts of the body  is called renal portal system is also present. 
• The blood is composed of plasma and cells. 
• The blood cells are RBC (red blood cells) or erythrocytes, WBC (white blood cells) or leukocytes and platelets. 
• RBCs are nucleated and contain red coloured pigment namely haemoglobin. 
• The blood carries nutrients, gases and water to the respective sites during the circulation. 
• The circulation of blood is achieved by the pumping action of the muscular heart.
   
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Lymphatic System

• Frogs have a lymphatic system also. 
• The lymphatic system consists of lymph, lymph channels and lymph nodes
• The lymph is different from blood. It lacks few proteins and RBCs