Animal responses

2. Part of the brain which coordinates homeostatic responses.(12)
5. Tiny contractile muscle fibres which group together.(10)
6. A REFLEX WHICH STRAIGHTENS THE LEG.(4,4)
9. The line in the centre of each I band.(5)
11. Part of the brain stem which connects the cerebellum and cerebrum(4)
12. An intracellular enzyme, activated by a range of hormones(6,7).
13. Nervous system that is under subconscious control.(9)
15. Thin layer of nerve cell bodies in the outermost layer of the cerebrum.(8,6)
16. A response that doesn’t involve the processing of the brain.(6)
17. Consists of the brain and spinal cord (abbreviation).(3)
20. Nervous system that is under conscious control.(7)
22. Blinking response(7,6)
23. Major tract of hormones connecting the two hemispheres of the cerebrum.(6,7)

1. Anterior lobe of the brain which secretes hormones(9,5)
3. The cytoplasm consisting of a high concentration of mitochondria and endoplasmic reticulum.(10)
4. Cells sensitive to chemical change. (13)
7. Describes cardiac muscle tissue that initiates its own contraction, without outside stimulation from nervous impulses(8)
8. The lighter bands in a myofibril (9)
10. The lighter region in the centre of each A band.(5)
11. Nervous system which consists of all the neurones that connect the CNS to the rest of the body.(10)
13. An abundant protein which forms actin filaments in all eukaryotic cells. (5)
14. A compound stored in muscles that serves as a phosphate reserve, enabling ATP regeneration.(8,9)
15. Example of a secondary messenger(4)
17. Part of the brain which coordinates movement and balance.(10)
18. The largest part of the brain which organises higher thought processes.(8)
19. The nerve pathway involved in a reflex action. (6,3)
21. A group of cells in the wall of the right atrium that generate electrical activity. (9,4).