Blood Clotting

Which 2 substances are released by platelets?

• Serotonin

• Thrombin

• Fibrin

• Thromboplastin

Which reaction is catalysed by thromboplastin?

• conversion of prothrombin to thrombin

• conversion of prothrombin to fibrin

• conversion of thrombin to prothrombin

• conversion of fibrinogen to fibrin

Which ions must be present for thromboplastin to work?

• Na⁺

• Cl^-

• Ca²⁺

• H⁺

Thrombin is an enzyme that converts fibrin to fibrinogen

• True

• False

What is the role of fibrin in blood clotting?

• acts as an enzyme

• forms a mesh of fibres to cover the wound

• causes smooth muscles in blood vessels to contract

• starts off the whole process

Which of the following is not the importance of blood clotting? Choose your answers.

• Prevent excessive blood lost

• Prevent the entry of pathogen into the blood vessels

• Prevent the dropping of blood pressure.

• Prevent the entry of oxygen into the blood

Tags

NGSS.HS-LS1-3

Name the blood cell and plasma protein that is responsible in blood clotting mechanism.

• Leucocytes

• Platelets

• Albumin

• Fibrinogen

• Erythrocytes

Why fibrin mesh is important in blood clotting mechanism?

• To attract more platelets.

• To attract more erythrocytes.

• To destroy pathogens.

• To prevent erythrocytes from flowing out.

Ariana lack of clotting factors that cause her blood to unable to clot when she is having a cut.

Name this disease.

• Haemophilia

• Talasemia

• Thrombosis

• Embolism

Tags

NGSS.HS-LS1-3

NGSS.HS-LS3-2

A boy accidentally cut his finger. the blood clots occur slowly. What caused the blood to clot slowly?

• Lack of vitamin D in his meal

• Lack of vitamin K in his meal

• The blood of the boy is infected with pathogens

• The blood of the boy flow with high pressure at the wound