Most animals and plants consist of different types of cells organised as tissues, organs and systems. The human respiratory system is a body system adapted for efficient gas exchange.
Which path describes the movement of oxygenated blood?
Vena cava to right atrium to right ventricle
Pulmonary vein to left atrium to left ventricle
Right ventricle to pulmonary artery to lungs
Why do large, multicellular organisms need a transport system?
The surface area to volume ratio of their bodies becomes too large
Concentration gradients between areas of the body are too large
Distances are too large to move substances by diffusion
Which adaptation in plants contributes to the efficient exchange of gases?
They are able to ventilate their leaves
The flattened shape of a leaf
Which one of the following is an adaptation to improving the efficiency of gaseous exchange?
Clusters of alveoli in the lungs increase the efficiency of gaseous exchange
The presence of rings of cartilage in the trachea
Ciliated cell linings of the airways
Which type of blood cell produces antibodies?
In the respiratory system, which structure connects the bronchi to the alveoli?
How are blood capillaries adapted for gaseous exchange?
There are always very high concentration gradients across capillaries
Their walls are just one cell thick
The blood in them is under high pressure
Which one of the following is NOT a tissue?
Which type of blood cell does not have a nucleus?
Red blood cell
Which of these statements is true of the heartbeat?
It spreads over the heart from the left atrium
It originates in a group of specialised cells in the wall of the heart
It spreads over the heart from the right ventricle