Which blood vessel has only one layer thick and function in material exchange?

The chamber of the heart that receives

oxygen-rich blood from the pulmonary vein.

The chamber of the heart that receives

oxygen-poor blood from the vena cava.

Which colored region has the highest blood pressure?

The order of vessels according to the pressure exerted to them from the highest to the lowest.

Natural pace maker which initiate mammalian heartbeat.

Which disease indicated by the following symptoms/signs:

1) Bronchioles collapse during expiration.

2) The alveoli burst.

3) The alveoli do not deflate very much.

4) Small quantities of elastin in the alveolar

walls

The component of cigarette smoke that poses a threat to human health. (The answer may be more than one)

Adaptation of human that live in high altitude.

The form of carbon monoxide inside the transport system of human that may cause death.

Function of Heme Group of Hemoglobin.

The molecules formed by the combination of hemoglobin and oxygen in blood.

Ions that sit on the porphyrin ring in hemoglobin molecules.

Labelled structure that has function in transporting mineral and ions from roots to leaves for photosynthesis.

Cortex of plant.

Labelled structure that has function in provide protection to the inner layer of plants.

Labelled structure that has function in storing products of photosynthesis

Labelled structure that has function in transporting the products of photosynthesis.

Labelled structure that has function in transporting the water and mineral ions to the leaves.