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. Put a tick (✓) or a cross (✗) in every box.
The endocrine system transmits signals more slowly than the nervous system. Describe additional ways in which the endocrine system and the nervous system differ.
Fig. 5.1 is 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 the changes to the region labelled D on Fig. 5.1 during muscle contraction.