Why is the circulatory not involved in insect respiratory mechanisms?

Insect respiration is independent of its circulatory system; therefore, the blood does not play a direct role in oxygen transport. ... These openings connect to the tubular network, allowing oxygen to pass into the body (Figure 11.14) and regulating the diffusion of CO2 and water vapor.

Insects have a circulatory system but it is an open one, which is why much emphasis is not laid on it compared to other vertebrates e.g in human when it comes to respiration

Explanation: The circulatory system in vertebrates unlike in insect is closed, meaning that blood is transported all over the body through a confined blood vessle, blood contains hemoglobin (red blood cell) which carries oxygen which aids in respiration, while in

Insects they only have hemolymph (like a blood) which doesn't contain hemoglobin this means that the circulatory system in insect doesn't aid in respiration which is why it is not included in the respiratory system of insect. Oxygen is rather delivered through the trachea of an insect.

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.