User interface language: English | Español

Date November 2018 Marks available 2 Reference code 18N.2.SL.TZ0.4
Level Standard level Paper Paper 2 Time zone TZ0 / no time zone
Command term Describe Question number 4 Adapted from N/A

Question

Label X and Y on the diagram of the heart.

[2]
a.

Explain how the circulatory system is able to transport the blood under high pressure from the heart to the rest of the body.

[3]
b.

The heart responds quickly to physical activity. Describe how heart rate is controlled to meet the increased circulatory demands.

[2]
c.

Markscheme

X: pulmonary artery ✔

Y: left atrium ✔

Accept auricle

a.

a. contraction of ventricle creates high pressure ✔

b. blood at high pressure is carried out of the heart through arteries ✔

c. thick muscular walls of arteries resist pressure/prevent leaks ✔

d. elastic recoil of arterial walls helps to push blood ✔

e. narrow lumen of arteries maintain pressure ✔

 

Features require an explanation, a list is inadequate

b.

a. nerve impulse from medulla/brain acts on heart/right atrium ✔

b. pacemaker/sinoatrial node/SAN increases/controls contraction of heart ✔

c. epinephrine/adrenaline «rapidly» increases heart rate ✔

c.

Examiners report

[N/A]
a.
[N/A]
b.
[N/A]
c.

Syllabus sections

Core » Topic 6: Human physiology » 6.2 The blood system
Show 59 related questions
Core » Topic 6: Human physiology
Core

View options