A seed of a plant you are examining has one "seed leaf", a structure that nourishes the growing plant embryo. A plant has leavon rith narallel yascular bundles.
A seed of a plant you are examining has one "seed leaf", a structure that nourishes the growing plant embryo. A plant has leavon rith narallel yascular bundles.
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter38: Introduction To Animal Organization And Physiology
Section: Chapter Questions
Problem 3TYK: A flexible, rubbery protein in connective tissue is called ___, whereas a more fibrous, less...
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![1) Homeostasis requires feedback loops in order maintain relatively constant internal conditions
Below, you will find a situation in which homeostasis is being maintained:
The human body must work to maintain a relatively constant concentration of Ca2+ in the blood
When the blood [Ca2+] drops below normal levels, cells called osteoclasts will release stored Ca
by breaking down bone. In order to begin this process, the osteoclasts must first come into
contact with PTH; this is how the osteoclasts know when to start breaking down bone tissue.
PTH is a hormone that is produced by the parathyroid glands when these glands detect that the
blood [Ca2+] has dropped below normal levels. As the release of Ca2+ brings blood [Ca²+] closer
to healthy levels, less PTH is secreted, until finally the blood [Ca²*] is back to healthy levels and
no PTH is secreted anymore.
a) Identify the sensor, control center, and effector in the situation described above.
Sensor:
Control center:
Effector:
b) Is this a negative or positive feedback loop?
NIK
2) Read the plant characteristics below. For each, determine whether the characteristic
of monocots or dicots. Write the letter M on the blank line if the answer is monocot, a
letter D if is corresponds to a dicot.
You observe the flowers on a variety of different species of plant. One spe
15
flowers per plant. Each flower on the plant has 16 petals.
You are in the process of weeding your garden. After a lot of pulling, yo
from the soil and notice that it has a very long root that extends deep into the soil
that are significantly smaller branch off from the side of the long root.
up a plant
few roots
A seed of a plant you are examining has one "seed leaf", a structure that nourishes the
growing plant embryo.
A plant has leaves that are narrow and long, with parallel vascular bundles.
12](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd2572e23-b9f6-402d-8eed-7fd6c3ddc1ca%2F47d3ef5d-d658-4f2c-b495-9ec360e5758f%2Ffwn1paj.jpeg&w=3840&q=75)
Transcribed Image Text:1) Homeostasis requires feedback loops in order maintain relatively constant internal conditions
Below, you will find a situation in which homeostasis is being maintained:
The human body must work to maintain a relatively constant concentration of Ca2+ in the blood
When the blood [Ca2+] drops below normal levels, cells called osteoclasts will release stored Ca
by breaking down bone. In order to begin this process, the osteoclasts must first come into
contact with PTH; this is how the osteoclasts know when to start breaking down bone tissue.
PTH is a hormone that is produced by the parathyroid glands when these glands detect that the
blood [Ca2+] has dropped below normal levels. As the release of Ca2+ brings blood [Ca²+] closer
to healthy levels, less PTH is secreted, until finally the blood [Ca²*] is back to healthy levels and
no PTH is secreted anymore.
a) Identify the sensor, control center, and effector in the situation described above.
Sensor:
Control center:
Effector:
b) Is this a negative or positive feedback loop?
NIK
2) Read the plant characteristics below. For each, determine whether the characteristic
of monocots or dicots. Write the letter M on the blank line if the answer is monocot, a
letter D if is corresponds to a dicot.
You observe the flowers on a variety of different species of plant. One spe
15
flowers per plant. Each flower on the plant has 16 petals.
You are in the process of weeding your garden. After a lot of pulling, yo
from the soil and notice that it has a very long root that extends deep into the soil
that are significantly smaller branch off from the side of the long root.
up a plant
few roots
A seed of a plant you are examining has one "seed leaf", a structure that nourishes the
growing plant embryo.
A plant has leaves that are narrow and long, with parallel vascular bundles.
12
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