Explanation: There are two major types of circulatory pathway present. They are closed type and open type circulatory system.

Explanation: Cockroach and other insects have open type circulatory system. In this type of system the blood does not flow inside the vessels.

Explanation: Closed circulatory system has blood closed at all time within the vessels. Blood is pumped by a heart through vessels and does not normally fill body cavities.

Explanation: Oxygen is carried in the blood in two forms. 1) Dissolved in plasma and RBC water and 2) Reversible bound to hemoglobin. In earthworm hemoglobin is found dissolved in the plasma.

Explanation: Heart is made up of muscles. It is an involuntary organ. Heart is made up of muscle called as myocardium.

Explanation: Circulatory system is an organ system that permits blood to circulate and transport nutrients, oxygen, carbon dioxide, hormones and blood cells. It is also known as vascular system or cardiovascular system.

Explanation: Platelets help in blood clotting. It is also known as thrombocytes. It is a component of blood.

Explanation: WBCs are white blood cells. It is also known as leukocytes. They are cells of immune system and helps in fighting infections.

Explanation: Annelids are a large phylum. They are also known as ringed worms or segmented worms. Closed circulatory system is found in annelids.

Explanation: In single circulatory system the blood passes only once through heart in each complete circuit. It is seen in fishes.