Complete Table 5.1 to show the features of three endocrine cell-signalling molecules: antidiuretic hormone (ADH), glucagon and insulin. Use a tick (✓) if the molecule has the feature and a cross (✗) if it does not have the feature. Put a tick (✓) or a cross (✗) in every box.
The endocrine system transmits more slowly than the nervous system. Describe other differences between the endocrine system and the nervous system.
Fig. 5.1 shows a transmission electron micrograph of a longitudinal section of striated muscle tissue in a relaxed state. State the letter on Fig. 5.1 that shows the length of a sarcomere.
State the letter on Fig. 5.1 that shows a region where actin and myosin overlap.
Describe and explain how the region labelled D on Fig. 5.1 changes during muscle contraction.