Here are a few that are:
Fingernails: Fingernails are made of keratin – a protein made of dead cells. In fact, structurally nails are modified hair . Cutting your hair and fingernails doesn’t hurt because they are dead – makes sense right. Horse hooves and bird feathers are also made of keratin.
Fingernails have no feeling. But the fingernail extends deep beneath and behind the skin of the cuticle, and nerves on the back of the finger around the cuticle sense forces transmitted from the tip of the fingernail. The brain integrates the sensations from the nerves of both th…
The matrix (see graphic below) is actually the nails growth zone and damaging that affects nail growth. However, the rest of our dead nail is attached to living skin of the nail bed. Tearing, piercing or bruising to this area may cause discolouration and can allow infections, like fungus to grow.
What parts of our bodies are made of dead cells? That depends!
Most of our body is covered with a type of tissue called platelet-granule cell (PCG). PCG is what gives hair grow hair. All the parts of our body are made up of cells. There is no such thing as a typical cell. Your body has many different kinds of cells. Though they might look different under a microscope, most cells have chemical and structural features in common. In humans, there are about 200 different types of cells, and within these cells there are about 20 different types of structures or organelles.
All cells have a membrane. Cell membranes are the outer layers that hold the cell together. They let nutrients pass into the cell and waste products pass out. Not everything can pass through a cell membrane. What gets through and what doesn’t depends on both the size of the particle trying to get in and the size of the opening in the membrane.
Cells also have a nucleus. This is the cell’s control center. Cells continually divide to make more cells for growth and repair in your body. The nucleus contains the information that allows cells to reproduce, or make more cells. Another important part of a cell is the mitochondrion. This is the part of the cell where food and oxygen combine to make energy.
You know that you need air to breathe. It is the oxygen in air that your body really needs. Every cell in your body needs oxygen to help it metabolize (burn) the nutrients released from food for energy. You also know that you need food. Food gives you energy, but oxygen is needed to break down the food into pieces that are small enough for your cells to use This is known as cellular respiration and it is the process of oxidizing food molecules, like glucose, to carbon dioxide and water. The energy released is chemically trapped for use by all the energy-consuming activities of the cell. Your cells are the energy converters for your body.
Different cells have different jobs to do.
