Homeostasis – WJEC

Homeostasis is the maintenance of a constant __________________ environment to keep conditions at an optimum. The nervous system and hormones are responsible for this.

• external

• internal

Tags

NGSS.HS-LS1-3

____________ carry messages around the body, but they work in a very different way to the structures in the nervous system.

• Glands

• Hormones

• Neurones

• Cells

Complete the following:

Nervous system : electrical messengers

Endocrine system: _____________ messengers

• chemical

• compound

• blood

• enzyme

A hormone called ___________________ is involved in the regulation of sugar (glucose) in the blood.

Tags

NGSS.HS-LS1-3

True of false

PANCREAS

Actions of insulin:

Low glucose: insulin is not secreted into the blood.

• True

• False

• Sometimes true, sometimes not

Tags

NGSS.HS-LS1-3

True of false

Actions of insulin:

LIVER

Low glucose: converts glucose into insoluble glycogen for storage

• True

• False

• Sometimes true, sometimes not

Tags

NGSS.HS-LS1-3

TRUE or FALSE:

Homeostatic control is achieved using negative feedback mechanisms:

• if the level of something rises, control systems reduce it again

• True

• False

• Sometimes true, sometimes not

Tags

NGSS.HS-LS1-3

TRUE or FALSE:

Homeostatic control is achieved using negative feedback mechanisms:

• if the level of something falls, control systems reduce it more.

• True

• False

• Sometimes true, sometimes not

Tags

NGSS.HS-LS1-3

TRUE or FALSE:

The hairs on the skin help to control body temperature. They lie flat when we are warm, and rise when we are cold.

• True

• False

Tags

NGSS.HS-LS1-3

Identify whether diagram shows the hairs of the skin when too warm or when too cold.

• When too warm, the hair erector muscle relaxes, lowering the hair

  • a thin insulating layer of air is trapped above the skin

  • more heat is lost to the environment

• When too cold, the hair erector muscle contracts, raising the hair

  • the hairs trap a thicker layer of air above the skin

  • the air insulates the skin against heat loss

• Either of the two conditions

Tags

NGSS.HS-LS1-3