"Receptors and Sense Organs" PPT courseware

Description

"Receptors and Sense Organs" PPT courseware

Part One: Situation Import

Classmates, what is this? How did you know? What did you use to see it, and how did you see it?

How can you tell if this disc contains music or songs?

learning target

1. Understand the structure and function of the ear; describe the formation process of hearing.

2. Explain the nature of stimulation by sight, hearing, smell, taste, skin touch, and temperature receptors.

independent inquiry

1. Read the textbook quickly and learn the structures of the ear.

2. What are the functions of these structures?

Receptors and sensory organs PPT, part 2 content: course exploration

Explore theme one

Ears and Hearing

1. Structure and function of the ear

2. The formation of hearing

External sound waves → ( ) → External auditory canal → (tympanic membrane) → ( ) → ( ) → ( ) →

(Contains auditory receptors) → auditory center, forming hearing.

The outer ear collects sound, the middle ear transmits sound, and the inner ear senses sound.

Expand and innovate

1. Why do people think that motion sickness and seasickness are related to the structure of the inner ear?

2. Why should we block the external auditory canal or open our mouth when encountering loud sounds?

Explore theme two

other feelings

1. Smell and taste

2. Touch

When a certain part of our body comes into contact with an external object, we will feel the presence of the object to varying degrees, and may even make certain judgments about the object's shape, hardness, smoothness, etc. This is the sense of touch.

The lips, nose tip, tongue tip, etc. of the human body are very sensitive to touch. The ventral side of the limbs is more sensitive to touch than the corresponding dorsal side. The density of touch receptors in sensitive parts is high, and there are many opportunities to provide information to the cerebral cortex.

3.Temperature sense

When the temperature of the external objects we come into contact with changes, causing the temperature of the skin and mucous membranes to change, we will feel "cold" or "hot". This is the temperature sense.

Receptors and sensory organs PPT, part three: course experiment

Exploration activity: Experiment on skin feeling "cold" and "warm" stimulation

Ask a question: The human body can feel temperature changes without the temperature receptors in the skin. When the ambient temperature is lower than the skin temperature, you will feel cold; when the ambient temperature is higher than the skin temperature, you will feel hot. How to use experimental methods to experience temperature sensation?

Method steps

1. Prepare three water tanks, marked as water tanks 1, 2, and 3 respectively. Then add water at room temperature (about 25°C) to water tank No. 1, add water 5°C higher than room temperature to water tank No. 2, and add water 10°C higher than room temperature to water tank No. 3. ℃ water.

2. At the beginning of the experiment, first immerse your left and right hands in the No. 1 and No. 3 water tanks respectively for about 10 seconds; then quickly transfer both hands to the No. 2 water tank for 1 to 2 seconds. At this time, pay attention to the difference in feeling between the left and right hands. .

3. After students in the group conduct the above experiments respectively, share their experiences to see if each other’s opinions are consistent.

4. Record the experimental results.

Phenomenon analysis

(1) The skin temperature of the left hand is higher than the temperature of cold water, making the person feel cold;

(2) The skin temperature of the right hand is lower than the temperature of hot water and feels warm;

(3) After 1 to 2 seconds, put both hands into warm water at the same time. If the skin temperature of the left hand is lower than the temperature of the warm water, the person feels warm; if the skin temperature of the right hand is higher than the temperature of the warm water, the person feels cold.

Summary

Skin temperature receptors sense stimuli that cause changes in skin temperature.

When stimulation causes the skin temperature to drop, you will feel "cold"; the receptors that sense cold stimulation (drop in skin temperature) are called cold receptors.

When stimulation increases the skin temperature, it will feel "warm"; the receptors that sense thermal stimulation (increase in skin temperature) are called thermoreceptors.

Receptors and sensory organs PPT, part 4: training to meet standards

1. The general process of human hearing is ().

A. Sound waves → eardrum → external auditory canal → ossicles → cochlea → auditory nerve → brain

B. Sound waves → eardrum → external auditory canal → cochlea → auditory nerve → brain → ossicles

C. Sound waves → external auditory canal → tympanic membrane → ossicles → cochlea → auditory nerve → brain

D. Sound waves → external auditory canal → ossicles → tympanic membrane → cochlea → auditory nerve → brain

2. Which of the following statements about the main characteristics of temperature sense is incorrect ( )

A. Thermoreceptors are located in the skin and mucous membranes

B. When stimulation causes the skin temperature to drop, it will feel "cold"

C. When stimulation increases the skin temperature, it will feel "warm"

D. The skin is equally sensitive to "cold" and "warm" stimuli

Keywords: Beijing Normal University Edition Biology PPT courseware for seventh grade volume 2 free download, receptors and sensory organs PPT download, .PPT format;

For more information about the "Human Body's Self-Regulating Receptors and Sensory Organs" PPT courseware, please click the Human Body's Self-Regulating PPT Receptors and Sensory Organs PPT tab.

"Receptors and Sense Organs" PPT download:

"Receptors and Sensory Organs" PPT Download Part One: Course Knowledge Points Knowledge Point 1 Structure and Function of the Eyeball 1. Sensory Organs Receptors together with their auxiliary structures are called sensory organs. For example, eyes and ears are sensory organs, and people receive 8 information from the outside world.

"Receptors and Sense Organs" PPT:

"Receptors and Sense Organs" PPT Part One: Situation Introduction Think about the scene when you eat, what did you feel at that time? Can you tell how the above feeling came about? Which part of the body do they come from? These feelings are helpful for you to complete the dining activity...

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Update Time: 2024-07-02

This template belongs to biology courseware Beijing Normal University Edition Seventh Grade Biology Volume 2 industry PPT template

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