Quiz on Connective Tissue

What is the origin of connective tissue?

• Mesodermal

• Neuroectodermal

• Endodermal

• Ectodermal

Answer explanation

Connective tissue originates from the mesoderm, one of the three primary germ layers in embryonic development. The mesoderm gives rise to various structures, including muscles, bones, and connective tissues.

Which of the following is NOT a type of connective tissue?

• Bone

• Epithelial tissue

• Cartilage

• Adipose tissue

Answer explanation

Epithelial tissue is not a type of connective tissue; it serves different functions such as protection and absorption. Bone, cartilage, and adipose tissue are all types of connective tissue.

What is the major polysaccharide component of ground substance?

• Hyaluronic acid

• Heparan sulfate

• Chondroitin sulfate

• Keratan sulfate

Answer explanation

Hyaluronic acid is the major polysaccharide in ground substance, providing viscosity and hydration. While heparan sulfate, chondroitin sulfate, and keratan sulfate are also present, they are not the primary component.

Which type of fiber is known for its elasticity?

• Collagen fibers

• Reticular fibers

• Elastic fibers

• Basophilic fibers

Answer explanation

Elastic fibers are specifically known for their ability to stretch and return to their original shape, making them the most elastic type of fiber. This distinguishes them from collagen and reticular fibers, which do not have this property.

What type of cells are fibroblasts?

• Immune cells

• Mesenchymal cells

• Fixed cells

• Plasma cells

Answer explanation

Fibroblasts are classified as mesenchymal cells, which are a type of stem cell that can differentiate into various cell types, including those that form connective tissues. They play a crucial role in tissue repair and maintenance.

Which connective tissue is characterized by loosely interwoven fibers?

• Reticular connective tissue

• Dense regular connective tissue

• Mucous connective tissue

• Loose (areolar) connective tissue

Answer explanation

Loose (areolar) connective tissue is characterized by loosely interwoven fibers, providing flexibility and support. This distinguishes it from dense regular connective tissue, which has tightly packed fibers.

What is the primary function of macrophages in connective tissue?

• Production of collagen

• Phagocytosis

• Storage of lipids

• Secretion of antibodies

Answer explanation

The primary function of macrophages in connective tissue is phagocytosis, which involves engulfing and digesting cellular debris, pathogens, and foreign substances, thus playing a crucial role in immune defense.

Which type of connective tissue is found in tendons?

• Adipose tissue

• Dense regular connective tissue

• Dense irregular connective tissue

• Loose connective tissue

Answer explanation

Tendons are primarily composed of dense regular connective tissue, which provides strength and resistance to pulling forces. This type of tissue has collagen fibers arranged in parallel, ideal for connecting muscles to bones.

What is the appearance of reticular fibers under a silver stain?

• Yellowish

• Colorless

• Acidophilic

• Argyrophilic

Answer explanation

Reticular fibers are argyrophilic, meaning they have an affinity for silver stains, which allows them to be visualized as dark lines under a microscope. This distinguishes them from other fiber types that do not react similarly.

Which of the following cells is involved in wound healing?

• Mast cells

• Neutrophils

• Eosinophils

• Myofibroblasts

Answer explanation

Myofibroblasts play a crucial role in wound healing by contracting and closing wounds, as well as producing extracellular matrix components that aid in tissue repair. Other cells listed are involved in immune responses, not directly in healing.