C2.2–C3.2 Neural Signalling, Body Systems & Defence
18 review questions with answers for C2.2–C3.2 Neural Signalling, Body Systems & Defence, marked SL and HL. Read them here, or play the set as a class game on the projector. Free to host, and students join with a code.
The phase where potassium (K⁺) channels open and K⁺ rushes out?
- Sodium-Potassium Pump (requires ATP)
- Hydrogen ions (H⁺)
- Phagocytes (or Macrophages)
- Repolarization (potential becomes negative again)Right answer
All 18 questions and answers
The phase where potassium (K⁺) channels open and K⁺ rushes out?
Answer: Repolarization (potential becomes negative again)
The brief dip below resting potential due to slow-closing K⁺ channels?
Answer: Hyperpolarization
The period after firing when a neuron cannot fire again, ensuring one-way travel?
Answer: Refractory Period
What maintains the resting potential by pumping 3 Na⁺ out and 2 K⁺ in per ATP?
Answer: Sodium-Potassium Pump (requires ATP)
Which enzyme breaks down ACh in the synaptic cleft?
Answer: Acetylcholinesterase
Receptors that detect changes in blood pressure by sensing the stretch of blood vessel walls?
Answer: Baroreceptors
Receptors that detect chemical changes, such as pH, CO₂, or O₂ levels in the blood?
Answer: Chemoreceptors
The brain region that acts as the control center for many homeostatic variables?
Answer: Hypothalamus
The part of the brain that specifically regulates heart rate and breathing?
Answer: Medulla oblongata
The homeostatic mechanism where the output of a system suppresses the original stimulus?
Answer: Negative Feedback
Which plant hormone is primarily responsible for coordinating tropic growth?
Answer: Auxin (IAA)
According to the acid growth hypothesis, what does auxin cause the cell to pump into the cell wall?
Answer: Hydrogen ions (H⁺)
Which small cell fragments in the blood initiate the clotting process?
Answer: Platelets
What is the insoluble, fibrous protein that forms the "mesh" of a blood clot?
Answer: Fibrin
What is the precursor molecule that thrombin converts into fibrin?
Answer: Fibrinogen (soluble)
What type of white blood cell engulfs and digests pathogens non-selectively?
Answer: Phagocytes (or Macrophages)
What is the process of a cell "eating" a pathogen called?
Answer: Phagocytosis
Any foreign molecule that triggers an immune response is called a/an...?
Answer: Antigen
Play it as a class game
Play this set opens it in splycr, where you can host it for your class straight away. Hosting needs no account: put the room code on the projector, and students join from a phone with the code and their first name. Each question plays as multiple choice, and the three wrong options are other answers from the same set.