Tissue
Cells
Fibers
Location
Loose/areolar
Fibroblasts, macrophages,
some lymphocytes, some
neutrophils
Few: collagen,
elastic, reticular
Around blood vessels;
anchors epithelia
Dense, fibrous
connective tissue
Fibroblasts, macrophages
Mostly collagen
Irregular: skin;
regular: tendons,
ligaments
Cartilage
Chondrocytes,
chondroblasts
Hyaline: few:
collagen
fibrocartilage: large
amount of collagen
Shark skeleton, fetal
bones, human ears,
intervertebral discs
Bone
Osteoblasts, osteocytes,
osteoclasts
Some: collagen,
elastic
Vertebrate skeletons
Adipose
Adipocytes
Few
Adipose (fat)
186
Blood
Red blood cells, white
blood cells
None
Blood
Table 2.
Connective Tissues
Muscle Tissues
Animal bodies contain three different types of muscle: smooth, skeletal, and cardiac. Their
differences include whether or not they have striations or bands, how many and where the nuclei are
located, whether they are under voluntary or involuntary control, and where they are located within
the body. These variations are summarized in Table 3.
Type of Muscle
Striations Nuclei
Control
Location
Smooth
No
Single, in center
Involuntary
Visceral organs
Skeletal
Yes
Many, at periphery
Voluntary
Skeletal
muscles
Cardiac
Yes
Single, in center
Involuntary
Heart
Table 3.
Types of Muscles
Nervous Tissues
Cells that are specifically designed to receive and transmit electrical impulses from particular
body regions and to send them to particular locations within the body make up nervous tissues. The
neuron, shown in Figure 127, is the primary cell of the nervous system. The neuron's cell body is the
substantial structure with a nucleus in the middle. Dendrites with specialized in receiving input or a
single axon with specialized in transmitting impulses are the two types of projections from the cell
body. Also visible are some glial cells. In order to improve the efficiency of the electrical nerve
impulse transfer, oligodendrocytes and astrocytes both control the chemical environment of the nerve
cell. The nutritional and waste needs of the neuron are supported by additional glial cells that are not
visible. A few glial cells are phagocytic, which means they clear away waste or damaged cells from
the tissue. Glial cells and neurons make up a nerve
97
.
.
97
Clark, M., Choi, J. Douglas, M. (2020)
Biology 2e
, Chapter 33, -Pp. 927-937. OpenStax,
https://openstax.org/details/books/biology-2e
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