Part 3: Vision

Q. What are the adaptive changes of the eye when looking at close objects?

Part 2: Auditory function

With auditory function tests (Rinne's and Weber's tests), sound transmission by air conduction is contrasted with that by bone conduction.

Q. Which of the following phenomena indicate hearing impairment of a patient? (Choose ONE OR MORE correct answers)

Tactile sensation (cont.)

Q. What aspects of tactile sensation do von Frey test and two-point discrimination detect?

Part 1: Tactile sensation

Table 1. Detection of punctate tactile stimuli on the skins of 3 different sites.

Table 2. Two-point detection threshold of the skins of 3 different sites.

Q. Based on the results listed above, which has the most sensitive skin among all?

Experiment 2: Summation of contractions

Q. Which of the following graphs looks most like the data you plotted for your nerve-muscle preparation?

True or False?

Each motor neuron innervates only one muscle fibre.

Q. The twitch response reaches a plateau at high stimulus intensities because all motor axons that can be recruited have been recruited.

Experiment 1: Graded stimulation of the sciatic nerve

Answer the following questions to check your understanding.

Q. The twitch response is graded because increasing stimulus intensities produce progressively bigger action potentials in the sciatic nerve.

Q. The threshold is the lowest stimulus intensity which can recruit axons close to the stimulating electrode.

Muscle contraction

In this practical, you conducted a number of experiments on an isolated nerve-muscle preparation, using the gastrocnemius muscle dissected from the cane toad (Bufo marinus).

Q. What type of muscle contractions were you measuring in this preparation?