Peripheral Nervous System

• Autonomic efferent output regulates visceral activities such as circulation and digestion. 
• ​The photoreceptors in the eye are sensitive only to wavelengths between 400 and 700 nanometres.
• ​Sympathetic stimulation increases the heart rate, whereas parasympathetic stimulation decreases it.
• Unlike the two-neuron chain of autonomic nerve fibers, the axon of a motor neuron is continuous from its origin in the CNS to its ending on skeletal muscle.


  True
• When an individual lacks a particular cone type, the resulting condition is called colour blindness which is more common in men.
• ​Within the eye, what innermost pigment layer contains nervous tissue?

  retina
• ​What is the photopigment in rods?

  rhodopsin
• ​Depth perception relies on what kind of field of vision?

  binocular
• ​Each autonomic nerve pathway extending from the CNS to an innervated organ is a two-neuron chain.
• The strength of the lens depends on its shape, which in turn is regulated by what muscle?

  ​ciliary muscle
• ​What kind of tactile receptor is stimulated by light, sustained touch?

  ​Merkel’s discs
• ​How is most of the motor activity in the somatic nervous system coordinated?

  subconciously
• ​Long postganglionic fibers originate in the ganglion chain and end on the effector organs.

  true
• ​Parasympathetic preganglionic fibers are longer than sympathetic preganglionic fibers.