Coordination and Response in Humans

Free sample questions

Coordination and Response in Humans — sample Biology questions with answers

1. Question 1

   What is the main function of the nervous system in the human body?

   • AControlling muscle movement without involvement of the brain
   • BProducing hormones to regulate body activities
   • CCoordinating and controlling the body's responses to stimuli
   • DDistributing oxygen throughout the body

   Answer: C. Coordinating and controlling the body's responses to stimuli

   The nervous system functions to coordinate and control the body's responses to stimuli from the external and internal environment. Other options are functions of other systems: (a) part of reflexes but not the main function, (b) endocrine system, (d) circulatory system.

2. Question 2

   Which part of a neuron is responsible for receiving nerve impulses from other neurons?

   • AAxon
   • BDendrite
   • CNucleus
   • DSynaptic terminal

   Answer: B. Dendrite

   Dendrites are short branches that receive impulses from other neurons and transmit them to the cell body. Axon transmits impulses away from the cell body, synaptic terminal releases neurotransmitters, nucleus controls cell activities.

3. Question 3

   In a reflex arc, the correct sequence of impulse pathway is:

   • AReceptor $\to$ motor neuron $\to$ sensory neuron $\to$ effector
   • BReceptor $\to$ sensory neuron $\to$ interneuron $\to$ motor neuron $\to$ effector
   • CEffector $\to$ sensory neuron $\to$ interneuron $\to$ motor neuron $\to$ receptor
   • DReceptor $\to$ interneuron $\to$ motor neuron $\to$ sensory neuron $\to$ effector

   Answer: B. Receptor $\rightarrow$ sensory neuron $\rightarrow$ interneuron $\rightarrow$ motor neuron $\rightarrow$ effector

   The reflex arc sequence: stimulus detected by receptor, impulse transmitted via sensory neuron to interneuron (in spinal cord), then to motor neuron, and finally to effector (muscle/gland).

4. Question 4

   What is the effect of stimulating the sympathetic nervous system on heart rate?

   • ADecreases heart rate
   • BIncreases heart rate
   • CNo effect
   • DStabilises heart rate

   Answer: B. Increases heart rate

   The sympathetic nervous system activates the 'fight or flight' response which increases heart rate, while the parasympathetic system decreases it.

5. Question 5

   Which part of the brain is responsible for controlling balance and coordination of muscle movements?

   • ACerebrum
   • BCerebellum
   • CMedulla oblongata
   • DHypothalamus

   Answer: B. Cerebellum

   Cerebellum controls balance, coordination of muscle movements, and posture. Cerebrum for cognitive functions, medulla oblongata for automatic functions like breathing, hypothalamus controls temperature and hormones.