Question

State and function of the following parts of the human circus
Blood
Blood vessels
Hount
State (2) conditions that are required for photosynthesis to
il How would you show that starch is formed during photosynthesis
Name four (4) types of forces.
State two differences between mass and weight of a body​

Answer 1

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1) State and function of the following parts of the human circulatory system

a) Blood - Blood has many different functions, including:

1. Transporting oxygen and nutrients to the lungs and tissues.
2. Forming blood clots to prevent excess blood loss.
3. Carrying cells and antibodies that fight infection.
4. Bringing waste products to the kidneys and liver, which filter and clean the blood.
5. Regulating body temperature.

b) Blood vessels - Blood vessels function to transport blood. In general, arteries and arterioles transport oxygenated blood from the lungs to the body and its organs, and veins and venules transport deoxygenated blood from the body to the lungs. Blood vessels also circulate blood throughout the circulatory system Oxygen (bound to hemoglobin in red blood cells) is the most critical nutrient carried by the blood. In all arteries apart from the pulmonary artery, hemoglobin is highly saturated (95–100%) with oxygen. In all veins apart from the pulmonary vein, the saturation of hemoglobin is about 75%.[citation needed] (The values are reversed in the pulmonary circulation.) In addition to carrying oxygen, blood also carries hormones, waste products and nutrients for cells of the body.

c) Heart - The heart is a pump, usually beating about 60 to 100 times per minute. With each heartbeat, the heart sends blood throughout our bodies, carrying oxygen to every cell. After delivering the oxygen, the blood returns to the heart. The heart then sends the blood to the lungs to pick up more oxygen.

2) State two conditions that are required for photosynthesis.

• carbon dioxide, water, and sunlight

3) How would you show that starch is formed during photosynthesis.

During photosynthesis, a simple carbohydrate, glucose is produced which is converted into complex carbohydrate, starch. The presence of starch can be detected by adding a few drops of iodine solution which turns into blue-black colour in the presence of starch.

4) Name four types of forces.

Fundamental force, also called fundamental interaction, in physics, any of the four basic forces—gravitational, electromagnetic, strong, and weak—that govern how objects or particles interact and how certain particles decay. All the known forces of nature can be traced to these fundamental forces.

5) State two difference between mass and weight of a body.

Mass

1. Mass is simply the measure of the amount of matter in a body.
2. Mass is always constant for a body and there are several formulas to calculate mass.

• One way to calculate mass is:
• Mass = volume × density

Weight

1. Weight is the measure of the amount of force acting on a mass due to acceleration due to gravity.
2. Weight is the measure of the gravitational force acting on a body.

• Weight can be calculated from the following formula:
• Weight = mass × acceleration due to gravity