Unit 1B: Sensation/Nervous System/Sleep

What is the primary function of the Central Nervous System?

• To regulate involuntary body functions

• To process and transmit information throughout the body

• To control muscle movements

• To detect changes in the environment

Answer explanation

The primary function of the Central Nervous System is to process and transmit information throughout the body, coordinating actions and responses to stimuli, which is essential for maintaining homeostasis.

Which part of the nervous system is responsible for the 'fight or flight' response?

• Sympathetic Nervous System

• Parasympathetic Nervous System

• Central Nervous System

• Somatic Nervous System

Answer explanation

The 'fight or flight' response is primarily controlled by the Sympathetic Nervous System, which prepares the body to react to stress or danger by increasing heart rate, dilating pupils, and redirecting blood flow to muscles.

What is the role of the Autonomic Nervous System?

• To transmit signals to the brain

• To process sensory information

• To regulate involuntary body functions

• To control voluntary muscle movements

Answer explanation

The Autonomic Nervous System regulates involuntary body functions such as heart rate, digestion, and respiratory rate, distinguishing it from the voluntary control of muscle movements.

Which stage of sleep is characterized by rapid eye movement?

• NREM Stage 1

• REM Sleep

• NREM Stage 3

• NREM Stage 2

Answer explanation

REM Sleep is the stage of sleep characterized by rapid eye movement, which is associated with vivid dreaming and increased brain activity. The other stages, NREM Stage 1, 2, and 3, do not feature this rapid eye movement.

What is the primary function of REM sleep?

• To process sensory information

• To regulate body temperature

• To consolidate memories

• To restore physical energy

Answer explanation

The primary function of REM sleep is to consolidate memories. During this stage, the brain processes and organizes information from the day, enhancing learning and memory retention.

What is the term for the body's internal clock that regulates the sleep/wake cycle?

• Consciousness

• Sleep Stages

• Circadian Rhythm

• REM Rebound

Answer explanation

The term 'Circadian Rhythm' refers to the body's internal clock that regulates the sleep/wake cycle, influencing various biological processes over a 24-hour period.

Which theory suggests that dreams are the brain's attempt to make sense of random neural activity?

• Consolidation Theory

• Activation Synthesis Theory

• Restoration Theory

• REM Rebound Theory

Answer explanation

Activation Synthesis Theory posits that dreams result from the brain's efforts to interpret random neural activity during sleep, making it the correct choice for understanding the nature of dreams.

What is the absolute threshold in sensation?

• The minimum difference between two stimuli

• The minimum stimulus energy needed to detect a stimulus

• The maximum stimulus energy that can be detected

• The ability to detect changes in stimulus intensity

Answer explanation

The absolute threshold refers to the minimum stimulus energy needed to detect a stimulus. This means it is the smallest amount of energy required for our senses to notice a stimulus, making the second option the correct choice.

What is the process of converting sensory stimuli into neural signals called?

• Accommodation

• Transduction

• Adaptation

• Sensation

Answer explanation

The process of converting sensory stimuli into neural signals is called transduction. It involves the transformation of physical energy from the environment into electrical signals that the nervous system can interpret.

Which theory explains color vision through three types of cones sensitive to different wavelengths?

• Frequency Theory

• Place Theory

• Opponent-Process Theory

• Trichromatic Color Theory

Answer explanation

Trichromatic Color Theory explains color vision by proposing that there are three types of cones in the retina, each sensitive to different wavelengths of light (red, green, and blue), allowing us to perceive a wide range of colors.