6. Organisms Respond to Changes in their Environments: Definitions (A Level only) (AQA A-Level Biology): Quizzes
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Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is the resting potential of an axon membrane?
What is the resting potential of an axon membrane?
mV
How many ions does the sodium-potassium pump move in each cycle?
How many ions does the sodium-potassium pump move in each cycle?
3 Na out, 2 K in
What causes hyperpolarisation at an inhibitory synapse?
What causes hyperpolarisation at an inhibitory synapse?
K exit and Cl entry
Which summation type involves a single presynaptic neurone firing at high frequency?
Which summation type involves a single presynaptic neurone firing at high frequency?
Temporal summation
Which cells in the islets of Langerhans secrete glucagon?
Which cells in the islets of Langerhans secrete glucagon?
α-cells
Which part of the loop of Henle has walls impermeable to water?
Which part of the loop of Henle has walls impermeable to water?
Ascending limb
What are the thin protein filaments in myofibrils composed of?
What are the thin protein filaments in myofibrils composed of?
Actin
What effect does IAA have on shoot elongation?
What effect does IAA have on shoot elongation?
Stimulates elongation
What is the sinoatrial node (SAN) commonly called?
What is the sinoatrial node (SAN) commonly called?
Heart's pacemaker
Which receptor detects blood pH changes in carotid artery walls?
Which receptor detects blood pH changes in carotid artery walls?
Chemoreceptor