Lesson Notes By Weeks and Term - Senior Secondary 2
Nervous system
Nervous system
TERM – 3RD TERM
WEEK THREE
Class: Senior Secondary School 2
Age: 16 years
Duration: 40 minutes of 5 periods each
Date:
Subject: Biology
Topic: NERVOUS SYSTEM
SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to
INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source
INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures
INSTRUCTIONAL PROCEDURES
PERIOD 1-2
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PRESENTATION |
TEACHER’S ACTIVITY |
STUDENT’S ACTIVITY |
|
STEP 1 INTRODUCTION |
The teacher discusses the organization of the nervous system |
Students pay attention |
|
STEP 2 EXPLANATION |
Teacher explain the differences between CNS and PNS |
Students pay attention and participate |
|
STEP 3 DEMONSTRATIO N |
Teacher ask students to draw the dorsal part of the brain of rabbit and the diagram of a neurone |
Students draw a diagram of a neurone.
|
|
STEP 4 NOTE TAKING |
The teacher writes a summarized note on the board
|
The students copy the note in their books |
NOTE
NERVOUS COORDINATION
The nervous system is a complex network of specialized cells, tissues, and organs that coordinate and regulate various functions in the body. It enables communication between different parts of the body and processes information from both the external environment and internal conditions. The nervous system consists of two main components: the central nervous system (CNS), which includes the brain and spinal cord, and the peripheral nervous system (PNS), which extends throughout the body and connects to the CNS. Neurons, the fundamental units of the nervous system, transmit electrical and chemical signals to facilitate communication and control various physiological processes.
Organization of the nervous system
The nervous system is organized into two main components: the central nervous system (CNS) and the peripheral nervous system (PNS).
i. Brain:
- The brain is the command center of the nervous system and is responsible for processing sensory information, thoughts, emotions, and coordinating various body functions.
- It is divided into different regions, each with specific functions, such as the frontal lobe for decision-making and motor control, the temporal lobe for auditory processing, and the occipital lobe for vision.
ii. Spinal Cord:
- The spinal cord is a long, tubular structure that extends from the base of the brain down the vertebral column.
- It serves as a pathway for nerve impulses traveling to and from the brain, facilitating communication between the brain and the rest of the body.
- The spinal cord is also involved in reflex actions, allowing for rapid responses to certain stimuli without direct involvement of the brain.
The PNS can be further divided into two main subdivisions:
i. Somatic Nervous System (SNS):
- Responsible for voluntary control of skeletal muscles and the reception of external stimuli.
- It enables conscious activities like walking, talking, and sensory perception.
ii. Autonomic Nervous System (ANS):
- Involuntary control of internal organs and glands.
- Further divided into:
a. Sympathetic Nervous System (SNS): Activates the "fight or flight" response, preparing the body for stressful situations by increasing heart rate, dilating pupils, etc.
b. Parasympathetic Nervous System (PNS): Promotes the "rest and digest" response, helping the body relax and recover by slowing heart rate, constricting pupils, etc.
EVALUATION: 1. Describe nervous coordination
CLASSWORK: As in evaluation
CONCLUSION: The teacher commends the students positively