Understanding Cells and Tissues

The video tutorial explains how similar cells in plants and animals form tissues, focusing on the human body. It describes the structure and function of various cells, including epidermis, muscle, bone, nerve, and blood cells. Each type of cell has a unique architecture suited to its function, such as muscle cells with myofibrils for contraction and nerve cells with axons for communication. The tutorial also covers the roles of red and white blood cells in oxygen transport and immune defense.

What forms bone tissue in the human body?

• Skin cells

• Nerve cells

• Bone cells

• Muscle cells

What is the primary function of the epidermis?

• To carry oxygen

• To provide a barrier against bacteria

• To secrete calcium

• To contract and expand

What are the fine threads found in muscle cells called?

• Axons

• Myofibrils

• Dendrites

• Red blood cells

What do bone cells secrete to form bones?

• Myofibrils

• Oxygen

• Actin

• Calcium

What is another name for nerve cells?

• White blood cells

• Neurons

• Red blood cells

• Myofibrils

What is the long fiber extending from the nerve cell body called?

• Myofibril

• Actin

• Axon

• Dendrite

How do nerve cells communicate with each other?

• By contracting and expanding

• Through myofibrils

• By secreting calcium

• Via signals passing from dendrites to axons

What is the primary function of red blood cells?

• To carry oxygen

• To provide a barrier against bacteria

• To engulf bacteria

• To secrete calcium

How many red blood cells are there in the body of an adult?

• 25 billion

• 25 million

• 25 trillion

• 25 quadrillion

What is the role of white blood cells?

• To provide a barrier against bacteria

• To defend against disease-causing bacteria

• To secrete calcium

• To carry oxygen