Control and coordination Worksheet-16

Control and coordination Worksheet-16

Subjective questions:

21. Name the organ which secretes progesterone.

22. Name the hormone that regulates calcium level in blood.

23. Mention the exact part of brain which controls the voluntary movements of muscles.

24. Name the hormone and its source, which produces changes in secondary sex organs in human females to prepare for anticipated pregnancy.

25. Name the hormone secreted by thymus gland.

26. Name the hormone secreted by the alpha cells of Islets of Langerhans of Pancreas.

27. Name the source glands of glucagon and parathormone.

28. Name the source glands of prolactin and estrogen.

29. What is a neuron?

30. Define coordination.

31. Discuss phototropism.

32. What is a ganglion?

33. Write the functions of any one part of hind brain.

34. Name the hormone secreted by thymus gland.

35. Which group of multicellular animals do not possess neurons?

36. Give the function of growth hormone.

37. Where are Nissl's granules found and what is their nature?

38. What happens when an impulse travel through a neuron?

39. What is the function of medulla oblongata?

40. Which two endocrine glands perform dual functions?

Answer:

21. Ovary.

22. Parathormone and Clacitonin.

23. Cerebellum.

24. Estrogen secreted by the Graafian follicle.

25. Thymosin

26. Glucagon.

27. Pancreas and Parathyroid glands.

28. Anterior lobe of pituitary and follicular cells of ovary respectively.

29. A neuron is an elongated branched cell that is fundamental unit of the nervous system and is specialised for conduction of impulses.

30. Coordination is the process involved in various organs of an organism to work together in a systematic manner, so as to produce a proper reaction to the stimulus.

31. Phototropism is the movement of a part of the plant in response to light. Shoots generally grow towards light and are said to be positively phototrophic while roots grow away from light and are said to be negatively phototropic.

32. Ganglion is referred to a mass of nervous tissue containing many cell bodies and synapses, usually enclosed in a connective tissue sheath.

33. Cerebellum part of hind brain controls the coordination of body movements and posture.

34. Thymosin.

35. Sponges.

36. Growth hormone regulates the development of bones and muscles.

37. Nissl's granules are found in cyton and dendrites. These are formed of ribonucleic acid (RNA).

38. When an impulse travels through a neuron, messages are transmitted through the neurons in the form of chemical and electrical signals.

39. Medulla oblongata is the regulating centre for swallowing, coughing, sneezing and vomiting.

40. Pancreas and testis/ovaries are two endocrine glands that perform dual functions.