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11/11/2018
Systems of reproduction
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Reproductive System function Produces gametes (eggs and sperm) Fertilization – produce zygote
How does the reproductive system help with reproduction? The testes produce the male gamete Eggs are produced in the ovary of the female before birth
Endocrine system function Regulates the body’s activities using hormones secreted by ductless glands Hormones: Chemical messengers
How does the endocrine system help with reproduction? The endocrine glands such as testes and ovaries secretes hormones to produce gametes. Endocrine glands also provide growth and development hormones to nurture an embryo
Nervous system function Control center for the body Receives, processes, and sends electrical signals
How does the nervous system help with reproduction? Hormones provide feedback to the brain; the brain signals for the release, or reuptake, of reproductive hormones.
Circulatory system function To transport molecules around the body Waste, nutrients, hormones, etc…
How does the circulatory system help with reproduction? Transports nutrients needed for the growth and development of the fetus. Transports hormones to testes and ovaries.
How do we stay balanced?
A process by which the body maintains a STABLE internal environment Homeostasis A process by which the body maintains a STABLE internal environment https://www.youtube.com/watch?v=62e8IV-WT8c
How does the air conditioner work? Too Cold (Heater On) 22 75°C Too Hot (Heater Off)
Stimulus produces a change in variable 3. Input information sent along afferent pathway to control center 4. Output information sent along efferent pathway to effector 2. Change detected by receptor 5. Effector influences magnitude of response & returns variable to homeostasis 1. Stimulus produces a change in variable
Negative Feedback OR STIMULUS RESPONSE RESPONSE STIMULUS Restoring the body back to its normal state (i.e. temperature) REDUCE change, stimulus and response work in OPPOSITE directions OR STIMULUS RESPONSE STIMULUS RESPONSE
Identify the setpoint. Identify the control center. Identify the effector. What are some ways that the homeostasis of the vehicle could be disrupted?
Negative Feedback (Temperature)
Negative Feedback (Maintaining Blood Sugar/Glucose level)
Negative Feedback (Blood pressure control) https://www.youtube.com/watch?v=YQMgV9pkwwA Blood pressure decreases
Negative Feedback (Immune Response)
Positive Feedback OR STIMULUS RESPONSE STIMULUS RESPONSE Causes the body to continue with more change (think of dominoes falling) AMPLIFIES change, stimulus and response work in THE SAME direction OR STIMULUS RESPONSE STIMULUS RESPONSE
Child birth https://www.youtube.com/watch?v=heWOEkjutHc
Blood clotting
What type of feedback is this? As you get dehydrated, your blood becomes thicker and harder to pump. Your kidneys will stop producing urine, and the water from urine is used to thin your blood.
What type of feedback is this? If your blood sugar gets too high or low, your pancreas releases a chemical to return the blood sugar back to normal.
What type of feedback is this? When you get cut, your skin releases chemicals to activate platelets to stop bleeding. Platelets then release more chemicals to activate even more platelets to help stop bleeding.
What type of feedback is this? When a baby suckles milk from their mother, a nerve in the mother’s nipple sends a signal to her brain which then tells her body to produce more milk.
What type of feedback is this? If the calcium in your blood decreases, a gland will sense the decrease and send a chemical message to your bones so it releases calcium back into the blood.