2.4 Blood pressure and heart disease -1

• Biology
• Middelbare school
• vwo
• Leerjaar 2

Ch. 2 The circulatory system

Materials 

- iPad

- Pen, pencil

- note book

For a mark

- No

Lessonup

- Yes

Bags

in bag closet

Phones 

in your bag /

in bag closet 

today''s program 

Homework revision: 

- table with differences among blood vessels 

- exercises ? questions 

2.4 : Blood pressure 

Homework

Learning objectives: 'what I am going to learn?'

I can .... 

• explain the reasons why there are different types of blood vessels in my body
• describe the differences between the types of blood vessels --> table 

New key terms:

artery/arteries - capillary/capillaries - vein(s) - connective tissue

previous lesson

ass.1: copy the table in your notebook 

        and fill in the cells while watching the video in the next slide 

	artery	capillary	vein
function	carries blood away from the heart	allows exchange of materials between capillary and body cells	carries blood towards the heart
pressure	highest (-> very fast blood flow)	low (->slow and smooth blood flow)	very low (-> slow and smooth blood flow)
lumen diameter	narrow	very narrow	wide
wall thickness	thick	extremely thin	thin
wall layers (names)	connective tissue smooth muscle elastic connective tissue smooth lining	1 cell layer	connective tissue smooth muscle elastic connective tissue smooth lining
valves	no	no	yes

check out your own table and make corrections if necessary 

assignment 3

Summarize important facts (video and par. 2.3)  by answering the following questions:

1. why do arteries have thick walls with large amounts of muscles and elastic fibres?
2. why do veins contain valves?
3. what is the driving force behind the blood flow in the veins? 
4. the blood pressure in capillaries is very low and so there is hardly any blood flow. Why is this functional? 

--> answers will be discussed in the next lesson 

previous less

1. Arteries must be capable of handling the high pressure with which the heart pumps the blood away. 
2. In order to make sure the blood keeps flowing towards the heart and does not fall back under low pressure, the veins are equipped with one-way valves (see figure 2.8).
3. The blood flow in your veins is also helped by your skeletal muscles. When your skeletal muscles contract, the veins inside them are squeezed and blood moves towards the heart (see figure 2.10).
4. Because the walls of capillaries are so thin, oxygen, water and nutrients easily flow out of them and into the tissues and cells that surround them (see figure 2.12).

Learning objectives: 'what I am going to learn?'

I can .... 

• explain what blood pressure is 
• where in the body blood pressure is the highest and where the lowest 
• describe 3 situation that may influence blood pressure 

New key terms:

blood pressure - taking ones pulse - systole - diastole 

assignment 1

• read and summarize 2.4 button A and B in your notebook
• watch the video (next slide)  and add new info to your summary 
• check whether the info in your summary covers when you have to answer the learning objectives and, eventually add new info. 


• learn your summary by heart before you continue....

assignment 2 : to take a pulse 

• watch the video in the next slide 
• take your own pulse in two situations: (you need the timer on your phone) 

1. at rest (after sitting silent for 45 seconds) 
2. after 45 seconds of jumping jacks (watch instructional video after the slide with 'take your pulse')

• calculate the amount of heartbeats/min in each situation 
• record both situations in your note book and upload a picture of it in the Google Classroom 

assignment 3 

• do exercises 1 - 4 in Brick's Biology without consulting your summary or buttons A, B or D
• consult your summary if necessary and add info to your answers 

homework 

1. do this LessonUp lesson 2.4 -Blood pressure and heart disease-1 ( do exercises 1-4 in Bricks Biology & learn your summary)
2. hand in the two pictures of assignment 1 en 2