IGCSE Coordinated biology B 9.1 and 9.3 Nerves and hormones

Nerve impulses are defined as an (a)   signal that passes along nerve cells.

What is the sceintific term for a nerve cell?

(a)  

The (a)   nervous system is composed of the brain and spinal cord.

Which of these is most likely to be a relay neurone?

• P

• Q

• R

Which of these is most likely to be a sensory neurone?

• P

• Q

• R

Which of these is most likely to be a motor neurone?

• P

• Q

• R

In which order do impulses pass through these 3 cells in a reflex arc?

• P --> Q --> R

• P --> R --> Q

• Q --> R --> P

• R --> P --> Q

Which statement about the hormone adrenaline is correct?

• It decreases blood glucose concentration.

• It is carried by the blood

• It is destroyed by the kidneys

• It slows down heart rate

A boy is frightened. His heart rate rises and his pupils dilate. Following this response, the plasma carries adrenaline to which organ to be destroyed?

• Liver

• Kidneys

• Heart

• Stomach

Which is the correct pathway in a reflex action?

• stimulus --> motor neurone --> relay neurone ---> sensory neurone --> response

• stimulus --> relay neurone --->motor neurone --> sensory neurone --> response

• stimulus --> sensory neurone --> relay neurone ---> motor neurone --> response

• stimulus --> sensory neurone --> motor neurone --> relay neurone ---> response