Explanation

The lifespan of white blood cells ranges from 13 to 20 days, after which time they are destroyed in the lymphatic system.

When immature WBCs are first released from the bone marrow into the peripheral blood, they are called "bands" or "stabs."

Explanation

The largest cell in the human body is the female ovum.

The egg cell can be up to 100 micrometers (0.1 millimeters) in diameter, making it visible to the naked eye.

The smallest cell in the human body is the male gametes, that is, sperm

Explanation

Human blood is red because haemoglobin,

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

Explanation

Mitochondria is known as powerhouse of cell because it serves as site for synthesis of Adenosine Triphosphate (ATP),

the energy currency of cell, through the process of aerobic cellular respiration.

ATP serves as energy currency for different cell activities.

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A cell consists of three parts:

1.      The cell membrane,

2.      The nucleus, and,

3.      Between the two, the cytoplasm.

Explanation

The nucleus is one of the most obvious parts of the cell when you look at a picture of the cell.

Explanation

Unicellular organisms: consists of one cell only that performs all vital functions including metabolism, excretion, and reproduction. 

Explanation

Vacuoles are generally small and help sequester waste products in animal cells.

Explanation

Chemical reactions that take place inside living things are called biochemical reactions. 

Explanation

Flagella are microscopic hair-like structures involved in the locomotion of a cell

Explanation

An ostrich egg about 15cm to 18 cm long and wide.