Download Nervous Tissue Homeostasis

11/21/2016
Bio100 (Dr
Paddack) Lecture
23 (11/2116)
 Exam ‘do-over’ quiz
I. Anatomy & Physiology (Ch 20 con’t)
A. Tissues - 4 types:
1. Epithelial (covered 11/14)
2. Connective (covered 11/14)
3. Muscle (covered 11/14)
4. Nervous
B. Organs
C. Homeostasis
D. Organ systems (see Ch 20 for overview)
1. Endocrine system
a. Components
b. Function
2. Nervous system (Ch 28.1-28.2, 28.11)
a. Components
b. Function
c. Evolution of nervous systems
i. Nerve net (Cnidarians, adult Echinoderms)
ii. Bilateral symmetry –cephalization & centralization
d. Two anatomical divisions of advanced nervous system
i. CNS
ii. PNS
e. Processing
i. Sensory input
ii. Integration
iii. Motor output
3. Circulatory system
a. Components
b. Function
4. Respiratory system (Ch 22.1-22.7)
a. Function
b. Gas exchange occurs via diffusion
c. Different respiratory systems:
i.
Diffusion across cell membrane/skin (requires moisture)
ii.
Gills (aquatic)
Ch 20
Organs are made up of different types of tissues,
each performing specific tasks in coordination
for an overall function
Nervous Tissue
Dendrite
nucleus
Cell body
axon
Homeostasis
Animal Organ Systems
1
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Nervous System
Nervous System
advanced in
predatory
Molluscs:
Cephalopods
(squid, octopus)
2
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Nervous System:
2 aspects
Respiratory system
 Moisture required
Neurons of PNS are bundled
together & wrapped in connective
tissue, forming nerves
2. Gills (aquatic)
1. Diffusion through cell
membrane or skin (aquatic or
very damp areas)
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Lecture 23 (11/21/16): Study Questions
1.
List the 4 types of tissues.
2.
Label this nerve cell (neuron) diagram correctly
with the following parts of the nerve cell (neuron): cell
body, dendrite, axon, nucleus, myelin sheath (Schwann
cells), synapse
3.
Why do neurons have so many branching extensions
(dendrites) off the cell body?
4.
Neurons are outnumbered by glia cells. List 4
different functions of the glial cells.
5.
Define organ & organ system.
6.
Define homeostasis
7.
Which organ system is most strongly involved in
maintaining homeostasis?
Lecture 23 (11/21/16): Study Questions
7.
Which organ system is most strongly involved in
maintaining homeostasis?
8.
Provide the basic components and overall function
of each of the following organ systems: endocrine,
nervous, circulatory, respiratory.
9.
What type of nervous system and body symmetry
do Cnidarians (jellyfish, anemones, etc) and adult
Echinoderms (seastars, urchins, etc) have?
10. Bilateral symmetry allows cephalization, as well as
distinguishing the nervous system into a central &
peripheral system. Note which part of the system is
involved in each step: sensory input, integration, motor
output.
Lecture 23 (11/21/16): Study Questions
11. Why do respiratory surfaces have to remain wet or
moist?
12. Define diffusion and use it to explain gas exchange
across a cell membrane.
13. What types of organisms undergo respiration simply
by diffusion across their cell membranes or skin?
14. What types of organisms have gills?
15. Define the parts of the gill: gill arch, gill filaments,
lamellae.
16. Why are there so many gill arches, gill filaments,
and lamellae?
17. Describe the countercurrent exchange system of the
gills. Why is it better?
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