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3 years ago

How is the structure, function and position of the crayfish nerve cord different from the rat's spinal cord?

1 answer:

3 0

In the crayfish's nerve cord, it is the combination of the two nerves that lead from the brain to form the ventral nerve cord which runs down the abdomen. It is important for sending signals from the ganglion to the appendages and muscles. While the rat's spinal cord it runs along the dorsal or back, rather than the front, and it is important for transferring neural signals between the brain and for the rest of the body.

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Select the three correct statements. a. They can convert the sun's energy into food. b. They cannot make their own food. c. They

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Answer:

If we are talking about plants A D E

Explanation:

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3 years ago

When conducting tests for the presence of a specific organic substance, it is very useful to include a ________ control, which w

olga_2 [115]

When conducting tests for the presence of a specific organic substance, it is very useful to include an Experiment control.

<h3>What are chemical changes?</h3>

A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions. Chemical reactions are usually characterized by a change in colour, heat change, precipitate formation and evolution of bubbles.

Example: Oxidation of magnesium

Thus, this could be the answer.

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2 years ago

Analyze the relationships between the anatomical structures and physiological functions of the muscular system by matching the t

Afina-wow [57]

Answer:

a. Endomysium 8. The layer of connective tissue that surrounds an individual muscle fiber

b. Epimysium 6. The layer of connective tissue that surrounds a skeletal muscle

c. Fascia 3. Connective tissue located between adjacent muscles

d. Fascicle 12. A small bundle of muscle fibers within a muscle

e. Myosin 11. Protein found within a thick filament

f. Perimysium 4. The layer of connective tissue that separates a muscle into small bundles

g. Sarcolemma 5. The plasma membrane of a muscle fiber

h. Sarcomere 7. Unit of alternating light and dark striations between discs (lines)

i. Sarcoplasm 2. The cytoplasm of a muscle fiber

j. Sarcoplasmic reticulum 9. A cellular organelle in muscle fiber corresponding to the endoplasmic

k. Tendon 10. The cordlike part that attaches a muscle to a bone

l. Transverse (T) tubule reticulum 1. Membranous channel extending inward from muscle fiber membrane

Explanation:

A muscle has around it epimysium, which is connective tissue. Inside the epimysium, there are fascicles, and around each of them, there is perimysium. Inside every fascicle, there are muscle fibers, each of them is surrounded by a connective tissue called endomysium. Between every muscle, there is also connective tissue and is called fascia. The connective tissue has vessels and provides support.

The muscle cells are called fibers. They have a membrane, the sarcolemma, a cytoplasm, the sarcoplasm, and a sarcomere, which is the functional unit of the fiber, in other words, it is the structure responsible for the contraction. The sarcomere has different bands made of thick filaments of myosin and thin filaments of actin. They are the light and dark striations that go from disc z to disc z when we observe the sarcomere under a special microscope. The sarcoplasmic reticulum is the place that stores the calcium necessary for the contraction of the fiber, and the transverse tubule reticulum allows the contraction of various fibers since they spread the action potential amongst fibers.

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3 years ago

Drag each tutorial feature to its learning purpose.

Alika [10]

Tutorial features are used to help in fast learning and their correct learning purposes are matched below.

<h3>Matching of tutorial features</h3>

Do a short multistep project or investigation: Lesson activity.

Lesson activity is defined as the outline of courses that surrounds what an individual would learn in a period of time.

View the definition of an important lesson word: Glossary link.

Glossary link is defined as the link that contains definition of words found in a book which are alphabetical arranged.

See if you are getting the main idea or developing an important skill in the lesson: Mastery test.

Mastery test is defined as the test that is used to evaluate the knowledge one has in a particular field of expertise.

Begin thinking about the lessons main topic: Warm up questions.

Warm up questions are used to prepare students for up coming lessons.

Make sure you've met the lesson overall lesson's objective: Knowledge check.

Knowledge check is used to evaluate if the students meet up with the aim of the lessons.

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2 years ago

Some plants have a waxy covering on their leaves. How does the waxy covering help

AVprozaik [17]

Answer:

It helps the plant retain water.

The waxy covering on plant leaves, young stems, and fruit is called the "cuticle". It is composed of cutin, a wax-like material produced by the plant that is chemically a hydroxy fatty acid. The purpose of this covering is to help the plant retain water.

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3 years ago

Read 2 more answers