Structural Organization in Animals

Cell junctions

________ hold them together and they are bundled together in a % % connective tissue sheath.

Cartilage

________ is solid and pliable and resists compression.

electrical disturbance

When a neuron is suitably stimulated, a(n) ________ is generated which swiftly travels along its plasma.

fibroblasts

It contains ________ (cells that produce and secrete fibres), macrophages and mast cells.

strength

The fibres provide ________, elasticity and flexibility to the tissue.

Muscles

________ are of three types, skeletal, smooth, and cardiac.

Neuroglia

________ makes up more than $ $ one- half the volume of neural tissue in our body.

Exocrine

________ glands secrete mucus, saliva, earwax, oil, milk, digestive enzymes, and other cell products.

little intercellular matrix

The cells are compactly packed with the ________.

Neural tissue

________ exerts the greatest control over the bodys responsiveness to changing conditions.

Communication junctions

________ (intercalated discs) at some fusion points allow the cells to contract as a unit, i.e., when one cell receives a signal to contract, its neighbours are also stimulated to contract.

Bones support

________ and protect softer tissues and organs.

bone marrow

The ________ in some bones is the site of the production of blood cells.

single layer of cube

It is composed of a(n) ________- like cells.

inner surface

They are mainly present on the ________ of hollow organs like bronchioles and fallopian tubes.

single layer of tall

It is composed of a(n) ________ and slender cells.

main circulating fluid

It is the ________ that helps in the transport of various substances.

main tissue

It is the ________ that provides a structural frame to the body.

Gap junctions

________ facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small molecules, and sometimes big molecules.

secrete fibres

In all connective tissues except blood, the cells ________ of structural proteins called collagen or elastin.

Bones

________ have a hard and non- pliable ground substance rich in calcium salts and collagen fibres which give ________ its strength.

Fibres

________ and fibroblasts are compactly packed in dense connective tissues.

animal tissues

In nearly all ________, specialized junctions provide both structural and functional links between their individual cells.

cylindrical fibres

Each muscle is made of many long, ________ arranged in parallel arrays.

Adipose tissue

________ is another type of loose connective tissue located mainly beneath the skin.

compound epithelium

The ________ consists of two or more cell layers and has a protective function as it does in our skin.

Simple epithelium

________ is composed of a single layer of cells and functions as a lining for body cavities, ducts, and tubes.

Limb bones

________, such as the long bones of the legs, serve weight- bearing functions.

cartilage

Most of the ________ in vertebrate embryos is replaced by bones in adults.

neuroglial

The ________ cell which constitutes the rest of the neural system protects and== supports neurons.

Cartilage

________ is present in the tip of the nose, outer ear joints, and between adjacent bones of the vertebral column, limbs and hands in adults.