Unit 2: Biological Basis of Behavior

Lily is studying biology and wants to know: How many pairs of chromosomes do humans have?

• 22

• 24

• 26

• 23

Multiple sclerosis involves a breakdown of the ________.

• myelin sheath
• neurotransmitters
• dendrites
• axon terminals

Luna is studying for her biology exam and wants to remember which organs make up the central nervous system. Which of the following should she write in her notes?

• the heart and lungs

• the stomach and intestines

• the kidneys and liver

• the brain and spinal cord

When Maya decides to walk across the room to pick up her book, her ability to make her legs move is controlled by the ________ Nervous System.

• Somatic

• skeletal system

• muscular system

• autonomic

Luna is curious about how her body can quickly react when she touches something hot. She learns that certain cells in her body help transmit information so she can move her hand away quickly. What are these specialized cells called?

• A neuron is a type of muscle cell that contracts.

• A neuron is a hormone that regulates mood.

• A neuron is a type of blood cell that carries oxygen.

• A neuron is a specialized cell that transmits information in the nervous system.

When Maya learns new information in class, the ________ in her neurons receive incoming signals from other neurons.

• dendrites

• myelin

• soma

• axon