14.3. Hormones
A subsection of Biology, 0610, through 14. Coordination and response
Listing 10 of 96 questions
shows the eye of a person in normal daylight. Complete by drawing the pupil to show the effect of shining a bright light into the eye. shows the names of five structures involved in a reflex arc. Complete by drawing four arrows to show the pathway and direction a nerve impulse travels during a reflex action. State the name of the junction between two neurones. The body is regulated by both the nervous system and by hormones. Table 3.1 shows information about the names of hormones, where they are produced and their actions in the body. Complete Table 3.1. Table 3.1 name of hormone where the hormone is produced in the body action the hormone has in the body insulin pancreas adrenal gland widened pupils, increased heart rate, raised blood glucose concentration testosterone receptor relay neurone sensory neurone effector motor neurone
0610_m19_qp_32
THEORY
2019
Paper 3, Variant 2
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For Examiner's Use shows a diagram of a cell from the pancreas that secretes the hormone, insulin. A B C State one function of each of the parts of the cell labelled A, B and C. A B C Glucose in the blood is absorbed by liver cells and muscle cells. These cells convert glucose to glycogen for storage. Explain why glucose needs to be converted to glycogen for storage rather than remaining dissolved in the blood. For Examiner's Use Other cells in the pancreas secrete the hormone glucagon. Glucagon stimulates liver cells, but has no effect on muscle cells. State the effect that glucagon has on liver cells. State how hormones, such as glucagon and insulin, travel around the body. Hormone Growth Promotants (HGPs) are hormones. HGPs are used to improve the production of food from animals. Many of these HGPs are hormones that are secreted naturally by the gonads (ovaries and testes). Name two hormones that are secreted by the gonads. The hormones are given to cattle by placing implants behind the ears. These release the hormones slowly during the animal’s life time. The advantages of using HGPs in meat production are: • more meat is produced per animal; • a 15 to 30 % increase in growth rate; • a 5 to 15 % improvement in conversion of feed into meat; • a decrease in greenhouse emissions from cattle. Suggest: the advantages of an increase in the conversion of feed into meat for the farmer; For Examiner's Use how the use of HGPs leads to a decrease in greenhouse emissions from cattle. HGPs are used in animal production systems in North America and Australia. The European Union (EU) has banned the use of HGPs and the import of meat from countries where the hormones are used. Suggest reasons for the ban on the use of HGPs in the EU.
0610_s13_qp_33
THEORY
2013
Paper 3, Variant 3
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Questions Discovered
96