Biology 30 - The Nervous System

What is Homeostasis?

• A state of relative stability within the body

• A balance between hot and cold

• A positive feedback system that alerts the body of external changes.

• A negative feedback system that alerts the body of internal changes.

Answer explanation

While Homeostasis involves a negative feedback system, it isn't only for internal factors.

The brain and spinal cord make up which part of the NS?

• Peripheral

• Somatic

• Central

• Sympathetic

Types of neurons include:

• Motor neuron

• Sensory neuron

• Schwann neurons

• Interneuron

Answer explanation

Motor neurons pass along instruction from CNS to muscles, glands, and organs called effectors.

Sensory neurons pass along information detected by bodily senses called receptors to CNS.

Interneurons, found entirely within the CNS, act as a link between sensory and motor neurons.

Which neuron is found entirely within the CNS?

• Interneuron

• Sensory neurons

• Schwann neurons

• Motor neurons

Answer explanation

interneurons act as a link between the CNS and the PNS.

The PNS is comprised of sensory and motor neurons.

The NS is composed of two types of cells: ___ and ___ cells.

The job of the Glial cells is . . .

• To actively contribute to neural transmittion.

• To nurish neurons, remove waste, and defend against infection.

• To regulate cell activity.

Answer explanation

Glial cells provde a supporting framework for the NS. They support neurons, outnumber them by 10: 1, and account for half the volume of the NS.

Neurons, organized into tissues, are called ____

Identify this neuron

• Motor

• Interneuron

• Sensory

Unlearned and involuntary responses.

• Reflexes

• Reflex arc

• Fight or Flight

• Parasympathetic

Connections of neurons that explain reflexive behavior:

• Fight or Flight

• Reflexes

• Autonomic

• Reflex Arc