A Layer of Impermeable Material, Such as Clay, That Prevents

question 51

Multiple Choice

A layer of impermeable material, such as clay, that prevents mixing of the ground water in the aquifers above and below it is called a ________ layer.

• A) blocking
• B) confining
• C) constraining
• D) restraining

---

Definitions:

Somatic Nervous System

A part of the peripheral nervous system that controls voluntary movements of the body through the control of skeletal muscles.

Autonomic Nervous System

The part of the nervous system that controls involuntary functions such as heart rate, digestion, and respiratory rate, divided into the sympathetic and parasympathetic systems.

Chemical Synapses

Specialized junctions through which neurons signal to each other and to non-neuronal cells, allowing the transmission of chemical messengers (neurotransmitters).

Electrical Synapses

Direct connections between neural cells allowing for rapid transmission of electrical signals through gap junctions.