University:
Sam Houston State University
Course:
BIOL 1406 | General Biology I
Academic year:

2023
Views:

359

Pages:

10
Author:

Clint W.

Dairy Cattle Breeding & Selection Reproduction “Endocrinology” Topic Objectives:  1. Describe the inter-relationship between the Endocrine system and the Nervous system.  2. Describe the origin and function of the major hormones involved with reproduction. I. Introduction A. Look at the two systems.  1. Endocrine System   a. Causes slower and longer lasting changes within the body. b. Examples: 1)  2)  3)  4)  Growth Reproduction Lactation Secondary Sex Characteristics  2. Nervous System   a. Causes rapid changes and/or adjustments within the body. b. Examples:  1) Immediate reaction to any kind of stress such as:  a) Pain  b) Fear  c) Heat  d) Exertion  e) Etc. B. The two systems work together as one system.  1. Called the Neuroendocrine System.   a. Referred to this way because of the overlapping effect each system has on the other. b. Example: Adrenaline will cover up the effects of oxytocin. C. Definitions to Know  1. Hormone: Chemicals synthesized from the endocrine glands that influence activities of other organs within the body.  Example: The ovary produces estrogen, progesterone, and relaxin, all of which affect the body in different ways.  2. Neurohormone: Chemicals synthesized in the central nervous system (or in the neuron; nerve cell) that influence activities of other organs within the body.  Example: FSH, LH (both produced in the anterior pituitary gland) and Oxytocin (produced in the posterior pituitary gland).  3. Neuroendocrine System: A combination of the endocrine system and the central nervous system working harmoniously. II. Hormone Secretions in the Female are brought about in two ways.  A. External Affects (Conditions occurring outside the body: i.e.: Environment)   1. Temperature changes: Extreme heat for example will cause the blood to circulate faster. 2. Improper handling of cattle causes the system to speed up due to adrenaline secretions.  B. Internal Affect (Conditions occurring inside the body: i.e.: Estrous Cycle)