Explanation

The image formed at the retina of the human eye is real and inverted.

 Real and inverted is due to the presence of a convex lens in the eye.

Explanation

Gastric juice, containing hydrochloric acid and digestive enzymes.

It is secreted by the glands in the stomach to aid in food digestion.

Explanation

In order to keep balance, it is important to have the feet between the centre of gravity and the centre of the Earth.

In case of climbing upwards, it is necessary to lean forward in order to keep the feet straight below the centre of gravity.

Explanation

Explanation

In humans and higher animals, the exchange of gases (oxygen and carbon dioxide) is carried out by the respiratory processes, which include:

• Breathing (inhalation and exhalation)
• Transport of gases through the blood
• Exchange of gases in the lungs (oxygen in, carbon dioxide out)

Explanation

• The renal artery is a blood vessel that carries oxygenated blood from the heart to the kidneys.
• It supplying them with the necessary blood flow to filter waste and excess substances from the body.

Explanation

The average weight of an adult human brain is about 1300 to 1400 grams.

It makes up around 2% of the total body weight but consumes about 20% of the body's energy.

Explanation

Veins carry blood toward the heart.

They have valves to prevent the backward flow of blood due to low pressure, especially in the limbs.

Arteries do not have valves (except at the heart).

Capillaries are too small and thin to have valves.

Explanation

Explanation

Human blood is red because haemoglobin,

haemoglobin is carried in the blood and functions to transport oxygen.