pulmonary vein

pulmonary artery

bronchiole

bronchus

alveolus

melanocyte in stratified squamous epithelium

intercallated disk of cardiac muscle

dense fibrous regular connective tissue

Produces and secretes collagen fibers.

Produces and secretes sweat through the sweat ducts in order to cool the blood by heat transfer.

Secretes the neurotransmitter acetylcholine (Ach) onto skeletal muscle cells.

Transmit the nervous signal from one neuron to another by secreting neurotransmitters.

Senses input information.

Absorbs mechanical shocks and sticks different tissues together.

Generating an action potential.

Propagates nervous signals along large distances within neurons.

cardiac muscle

skeletal muscle

smooth muscle

Insulate the axon to increase the speed of propagation.

Form the blood brain barrier.

Produce cerebrospinal fluid (CSF) for perfusion.

Conduct nervous signals.

autonomic

somatic