Neuroscience and Behavior Notes 2-2 (obj 7-10)

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Neuroscience and Behavior Notes 2-2 (obj 7-10)

1.) Nervous System Central Nervous System (CNS) Peripheral Nervous (PNS) OBJECTIVE 7| Describe the nervous system’s two major divisions, and identify the tree types of neurons that transmit information through the system.

Nervous System: Consists of all the nerve cells Nervous System: Consists of all the nerve cells. It is the body’s speedy, electrochemical communication system. Central Nervous System (CNS): the brain and spinal cord. Peripheral Nervous System (PNS): the sensory and motor neurons that connect the central nervous system (CNS) to the rest of the body.

The Nervous System

Interneuron Neuron (Unipolar) Kinds of Neurons Sensory Neurons carry incoming information from the sense receptors to the CNS. Motor Neurons carry outgoing information from the CNS to muscles and glands. Interneurons connect the two neurons. Interneuron Neuron (Unipolar) Sensory Neuron (Bipolar) Motor Neuron (Multipolar)

Kinds of Glial Cells Astrocytes provide nutrition to neurons. Oligodendrocytes and Schwann cells insulate neurons as myelin. Astrocytes

2.) Peripheral Nervous System Somatic Nervous System: The division of the peripheral nervous system that controls the body’s skeletal muscles. Autonomic Nervous System: Part of the PNS that controls the glands and other muscles. OBJECTIVE 8| Identify the subdivisions of the peripheral nervous system, and describe their functions.

The Nerves Nerves consist of neural “cables” containing many axons. They are part of the peripheral nervous system and connect muscles, glands, and sense organs to the central nervous system.

Autonomic Nervous System (ANS) Sympathetic Nervous System: Division of the ANS that arouses the body, mobilizing its energy in stressful situations. Parasympathetic Nervous System: Division of the ANS that calms the body, conserving its energy.

Autonomic Nervous System (ANS) Sympathetic NS “Arouses” (fight-or-flight) Parasympathetic NS “Calms” (rest and digest)

3.) Central Nervous System The Spinal Cord and Reflexes OBJECTIVE 9| Contrast the simplicity of the reflex pathways with the complexity of neural networks. Simple Reflex

Central Nervous System The Brain and Neural Networks Interconnected neurons form networks in the brain. Theses networks are complex and modify with growth and experience. Complex Neural Network

4.) The Endocrine System The Endocrine System is the body’s “slow” chemical communication system. Communication is carried out by hormones synthesized by a set of glands. OBJECTIVE 10| Describe the nature and functions of the endocrine system and its interaction with the nervous system.

Hormones Hormones are chemicals synthesized by the endocrine glands that are secreted in the bloodstream. Hormones affect the brain and many other tissues of the body. For example, epinephrine (adrenaline) increases heart rate, blood pressure, blood sugar and feelings of excitement during emergency situations.

Pituitary Gland Is called the “master gland.” The anterior pituitary lobe releases hormones that regulate other glands. The posterior lobe regulates water and salt balance.

Thyroid & Parathyroid Glands Regulate metabolic and calcium rate.

Adrenal Glands Adrenal glands consist of the adrenal medulla and the cortex. The medulla secretes hormones (epinephrine and norepinephrine) during stressful and emotional situations, while the adrenal cortex regulates salt and carbohydrate metabolism.

Gonads Sex glands are located in different places in men and women. They regulate bodily development and maintain reproductive organs in adults.