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Leaving certificate biology

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  1. Ecology theory
    5 Topics
    |
    1 Quiz
  2. Unit 1
    Nutrient recycling
    4 Topics
    |
    1 Quiz
  3. Ecological relationships and population dynamics
    2 Topics
  4. Human impact on the ecosystem
    2 Topics
  5. Study of a grassland ecosystem
    3 Topics
  6. Responses in the Flowering Plant
    4 Topics
    |
    1 Quiz
  7. Unit 3
    Sexual reproduction in the flowering plant
    1 Topic
  8. The human reproductive system
    3 Topics
  9. The menstrual cycle
    2 Topics
  10. Pregnancy
    2 Topics
  11. The circulatory system
    4 Topics
  12. Blood
    5 Topics
  13. The heart
    5 Topics
Lesson 13, Topic 5
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Why is the blood in the right side of the heart kept separate from the left?

Prevents oxygenated and deoxygenated blood from mixing

Answer

In relation to heartbeat, what is meant by diastole?

Relaxation

Answer

Write brief note on the sounds created during the cardiac cycle

  • The sounds are “lub” + “dub”
  • Caused by valves closing
  • Tricuspid and bicuspid close causing “lub” sound
  • Semilunar valves close causing “dub” sound
Answer

In what part of the heart is the pacemaker located ?

Wall of the right atrium

Answer

State one location of a semi-lunar valve, and describe its function.

Location:

Between the right ventricle and base of pulmonary artery

Function:

Prevent blood flow back into right atrium

Answer

A pulse is usually easily detected at the wrist. Explain why.

Artery close to skin surface

Answer

Why is there no need for arteries to contain valves ?

Blood under pressure so backflow will not occur

Answer

State two lifestyle choices a person could make which would improve heart health

  • Stop smoking

  • Take more regular exercise

  • Reduce salt intake

  • Reduce intake of saturated fat

Answer

Blood acts as a transport medium in the human body. Name two substances, other than food molecules and water, that are transported in the blood.

  • Urea

  • Hormones

  • Antibodies

  • Oxygen

  • Carbon dioxide

  • Plasma proteins

Answer

Draw a diagram to show the structure of the human heart and associated blood vessels

Answer

State the precise location and describe the role of the SA node and AV node

SA node

Location: Right atrium

Role: Generates electrical impulses that cause atrial systole

AV node

Location: In septum between right atrium and right ventricle

Role: Generates an electrical impulse that causes ventricular systole

Answer

What is measured when a persons blood pressure is taken ?

  • Force of blood against the wall of the artery

  • Force required to stop flow of blood in the artery

Answer

Explain what is meant by a portal system

A portal system begins and ens with capillaries

Answer

What is a pulse ?

  • Wave vibrations passing down along the wall of the artery

  • Due to expansion of the artery

Answer

From what part of the body is human blood pressure usually measured ?

Artery of upper arm

Answer

Draw a labelled diagram of a transverse and longitudinal section through a human vein to show its structure

Answer

What is the pulse?

The rhythmic stretching of an artery

Answer

What makes the wrist a suitable part of the body to detect a pulse ?

Artery near the surface

Answer

What makes the wrist a suitable part of the body to detect a pulse ?

Artery near the surface

Answer

State the location of the pacemaker

Wall of right atrium

Answer

What makes the wrist a suitable part of the body to detect a pulse ?

Artery near the surface

Answer

What is the function of the heart in the circulatory system ?

Pump

Answer

Name the arteries that supply the cardiac muscle of the heart

Coronary arteries 

Answer

Indicate the position of the semi-lunar valves during :

Atrial systole

Ventricular systole

Atrial systole: Open

Ventricular systole: Closed

Answer

Name dietary factors that are know to contribute to coronary heart disease

 

  • High cholesterol

  • High saturated fat

  • High salt

 

Answer