Presentation 19 - Chemical Signals In Animals

50 %
50 %
Information about Presentation 19 - Chemical Signals In Animals
Education

Published on March 3, 2009

Author: seasprite

Source: slideshare.net

 

Key concepts Hormones are compounds produced in one part of the body and transported to another location to produce specific responses; small amount s can induce substantial responses. Chemical signals produced by the body are mostly produced by glands . Hormones either affect a target effector organ directly or via the signal transduction pathway . Effects of hormones vary depending on whether they bind to a receptor in the plasma membrane or within the nucleus of a cell. Action of hormones is controlled by feedback mechanisms . Hormones are classified by mode of transport or through chemical composition . Diseases in the endocrine system occur when levels of hormones released are at an abnormal level or when receptors of that particular hormone are damaged.

Hormones are compounds produced in one part of the body and transported to another location to produce specific responses; small amount s can induce substantial responses.

Chemical signals produced by the body are mostly produced by glands .

Hormones either affect a target effector organ directly or via the signal transduction pathway .

Effects of hormones vary depending on whether they bind to a receptor in the plasma membrane or within the nucleus of a cell.

Action of hormones is controlled by feedback mechanisms .

Hormones are classified by mode of transport or through chemical composition .

Diseases in the endocrine system occur when levels of hormones released are at an abnormal level or when receptors of that particular hormone are damaged.

Endocrine system Hormone-secreting cells Chemical signals secreted into body fluids, eliciting responses in target cells Functions with NS in maintaining homeostasis Effects are slower and longer-lasting

Hormone-secreting cells

Chemical signals secreted into body fluids, eliciting responses in target cells

Functions with NS in maintaining homeostasis

Effects are slower and longer-lasting

Maintenance of Homeostasis by the ES and NS Neurosecretory cells – nerve cells that secrete hormones into bloodstream (eg. epinephrine ) Feedback regulation Positive feedback Suckling  release of oxytocin  milk secretion Negative feedback Control of blood calcium and glucose levels

Neurosecretory cells – nerve cells that secrete hormones into bloodstream (eg. epinephrine )

Feedback regulation

Positive feedback

Suckling  release of oxytocin  milk secretion

Negative feedback

Control of blood calcium and glucose levels

Invertebrate Endocrine Systems Hydra –control method of reproduction Mollusks –controls egg-laying Arthropods – extensive endocrine systems for molting and maturity Ecdysone  molting and promotion of adult features Brain hormone (BH)  regulates production of ecdysone Juvenile hormone (JH)  retention of larval characteristics

Hydra –control method of reproduction

Mollusks –controls egg-laying

Arthropods – extensive endocrine systems for molting and maturity

Ecdysone  molting and promotion of adult features

Brain hormone (BH)  regulates production of ecdysone

Juvenile hormone (JH)  retention of larval characteristics

Chemical signals and their modes of action most peptides, proteins and glycoproteins steroids and thyroid hormones

Importance of signal transduction pathways 1) Different pathways in different cells  different responses to the same signal 2) Amplification of the single signal allows small amounts of hormones to have a large effect

1) Different pathways in different cells  different responses to the same signal

2) Amplification of the single signal allows small amounts of hormones to have a large effect

Vertebrate endocrine systems Hypothalamus integrates endocrine and nervous functions Neurosecretory cells of hypothalamus produce trophic/tropic hormones Stored and secreted by posterior pituitary Affect anterior pituitary’s release of own hormones

Hypothalamus integrates endocrine and nervous functions

Neurosecretory cells of hypothalamus produce trophic/tropic hormones

Stored and secreted by posterior pituitary

Affect anterior pituitary’s release of own hormones

Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings

Table 45.1 (continued ) Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings

Feedback control loops: a closer look Regulation of thyroid hormones Regulation of glucose in the blood

Regulation of thyroid hormones

Regulation of glucose in the blood

Hormones and the female reproductive cycle

Hormones control the reproductive cycle of human females

Performance-enhancing drugs

Add a comment

Related presentations

Related pages

Presentation 19 - Chemical Signals In Animals - Education

×Close Share Presentation 19 - Chemical Signals In Animals. Embed ...
Read more

Chemical Signals in Animals: Endocrine System and Hormonal ...

Chemical Signals in Animals: Endocrine System and Hormonal ... Document presentation ... Control Slide 19 Chemical Signals Chemical Signals ...
Read more

PPT – Chemical Signals in Animals Chapter 47 Chemical ...

Chemical Signals in Animals Chapter 47 Chemical Signals in Animals Hormone - chemical signal that circulates through the blood or other bodily fluids and ...
Read more

PPT – Chemical signals in animals PowerPoint presentation ...

The presentation will start after a short (15 second) video ad from one of our sponsors. Hot tip: Video ads won’t appear to registered users who are ...
Read more

Chapter 45: Chemical Signals in Animals - Documents

Chapter 45: Chemical Signals in Animals. by kuitang. on Apr 11, 2015. Report Category: Documents
Read more

Animal communication - Wikipedia, the free encyclopedia

... or apply additional chemical signals. ... Famous examples are the mutual presentation of reeds by ... Food-related signals: Many animals make ...
Read more

Chapter 45 Chemical Signals in Animals - Documents

Chapter 45 Chemical Signals in Animals. The endocrine system and the nervous system are structurally, chemically, and functionally related. Regulatory ...
Read more

PowerPoint Presentation - Lago Vista ISD

are chemical signals that are secreted into the circulatory system and ... Figure 45.19 Specialized role of a hormone ... PowerPoint Presentation
Read more