OCR AS Biology 5

Welcome to your OCR AS Biology 5

Which animal phylum was the first to evolve with special respiratory organs?

What happens to the gases inhaled apart from oxygen?

Select the incorrect statement regarding COPD.

What is the first step of expiration?

How does the oxygen move from the lungs into the blood stream?

Which is not a function performed by the stomach?

The body structure which protects the lungs from physical harm.

Adaptation of some insects to reduce water loss.

How is Vitamin B12 absorbed into the body?

Which of the following is not a reason for the evolvement of respiratory surfaces with high AV ratios?

What happens when carbon monoxide concentration increases in the blood?

Select the correct statement/s from the following.
a) Human heart is a hollow muscular organ.
b) It is a major component of human circulatory system.
c) It is about the size of it's owner's fist.
d) It consists of 2 layers.

Lungs are encased in thin membranes called ________.

Which of the following is not a function of bile salts?

What is the respiratory organ of a mosquito?

Select the correct sequence of steps which shows the movement of oxygen through an insect.
a) Spiracle closes.
b) Oxygen is delivered directly to respiring tissues.
c) Oxygen diffuses through the trachea into the tracheoles.
d) Oxygen enters the insect through spiracles and into the trachea.

Which of the following statement is correct regarding the location of human heart?

What are the 3 layers of a heart?
a) Endocardium
b) Epicardium
c) Pericardium
d) Myocardium

Windpipe is also known as the _________.

Select the incorrect statement regarding the system of trachea in insects.