muscle tissue, nervous tissue CT, and body membranes

muscle tissue

• a lot of blood vessels

• responsible for movement

• possesses myofilaments made up of actin and myosin proteins that have it contract

3 types of muscle tissue

skeletal muscle

cardiac muscle

smooth muscle

skeletal muscle tissue

• voluntary muscle(under our conscious control)

• has striations

• called muscle fibers- long and cylindrical

• multiple nuclei

• have myofilaments

skeletal muscle tissue function

voluntary movement; manipulation of environment; voluntary control

skeletal muscle location

skeletal muscle attached to bones or occasionally to skin

cardiac muscle

• involuntary muscle

• contains striations; cells only have 1 nucleus

• have many branches that join other branches

• intercalated discs: special joints where cardiac muscles are joined

• as it contracts, propels blood into the circulation

cardiac muscle function

as it contracts, it propels blood into circulation

cardiac muscles location

walls of heart

smooth muscle tissue

• involuntary muscle

• no visible striations

• rod shapes cells with 1 nucleus

smooth muscle function

propels substances or objects along internal passageways

smooth muscle location

mostly in walls of hollow organs(digestive and urinary tract organs, uterus, blood vessels)

nervous tissue

• main component of nervous system

• transmit electrical signals from sensory receptora and to effectors which control activity

• made up of neurons which are nerve cells that generate and conduct nerve impulses

• supporting cells that support and protect neurons

nervous tissue location

brain, spinal cord, nerves.

bodys membrane

-composed of 2 primary tissue types: epithelium bound to underlying connective tissue proper

3 types of body membranes

• cutaneous membranes

• mucous membranes

• serous membrane

cutaneous membranes

• skin

• keratinized stratified epithelium(epidermis) attached to thick layer of connective tissue(dermis)

• skin is a dry membrane bc it is exposed to air

mucous membrane(mucosa/mucosae)

• line body cavities that are open to the exterior

• moist membrane bathed my secretions

• epithelial sheets li over loose areolar connective tissue

• may secrete mucus.

• ex: mucosa of both the digestive and respiratory tracts secrete a lot of lubricating mucus

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serous membrane

• in closed body cavities

• made of simple squamous epithelium resting on areolar CT

• parietal serosae line internal body cavity walls

• visceral serosae cover internal organs

• between layers is filled w slippery serous fluid, so these membranes slide across each other easily

• pleurae- lungs

• pericardium- heart

• peritoneum-adminopelvic