Animal Tissues — Important Questions

Fat storage and insulation

Adipose tissue stores fat and provides insulation. Step 1: Adipose tissue is a type of connective tissue found below the skin and around internal organs. Step 2: Its cells are filled with fat globules that store energy in the form of fat. Step 3: The stored fat acts as an insulator, preventing heat loss from the body during cold weather. Step 4: This is why older people with less adipose tissue feel colder and shiver more. Step 5: Transportation is done by blood, movement by muscles, and signal transmission by nervous tissue.

Dendrites

Dendrites are the receiving parts of neurons. Step 1: Dendrites are short, branched projections from the cell body of a neuron. Step 2: They act like antennas that receive signals (impulses) from other neurons. Step 3: The axon carries signals away from the cell body to other neurons. Step 4: The cell body contains the nucleus and processes the received information. Step 5: The myelin sheath is a covering that speeds up signal transmission but doesn't receive signals.

Platelets

Platelets are essential for blood clotting. Step 1: Platelets are small, disc-shaped cell fragments without a nucleus. Step 2: When a blood vessel is injured, platelets quickly accumulate at the injury site. Step 3: They stick together and release chemicals that help form a blood clot. Step 4: This clot seals the wound and prevents further blood loss. Step 5: Red blood cells carry oxygen, white blood cells fight infection, and plasma is the liquid part of blood.

Ligament

Ligaments connect bones to bones at joints. Step 1: Ligaments are strong, elastic connective tissues made of collagen fibers. Step 2: They connect bones to other bones at joints and hold them in proper position. Step 3: Their elastic nature allows joint movement while preventing excessive movement that could cause injury. Step 4: Tendons connect muscles to bones, cartilage cushions joints, and areolar tissue fills spaces between organs. Step 5: Without ligaments, our joints would be unstable and bones could separate easily.