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3 years ago

What are 3 contributions that trypanosoma brucei give to the environment

1 answer:

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Trypanosoma brucei rhodesiense and T. brucei gambiense, the ... TLF present in human serum (TLF1 and TLF2) provide innate resistance ... where the parasites are present and it disappears after 2 or 3 weeks. ... to adapt themselves.

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Increases and decreases of the heart rate result from changes in the activity of the _______. A. medulla oblongata B. thalamus C

pantera1 [17]

Option A. Increases and decreases of the heart rate result from changes in the activity of the <u>medulla oblongata</u>

<u></u>

What is medulla oblongata ?

Medulla oblongata, also called medulla, the lowest part of the brain and the lowest portion of the brainstem.
The medulla oblongata is connected by the pons to the midbrain and is continuous posteriorly with the spinal cord, with which it merges at the opening (foramen magnum) at the base of the skull.
The medulla oblongata plays a critical role in transmitting signals between the spinal cord and the higher parts of the brain and in controlling autonomic activities, such as heartbeat and respiration
The medulla is divided into two main parts: the ventral medulla (the frontal portion) and the dorsal medulla (the rear portion; also known as the tegmentum).
The ventral medulla contains a pair of triangular structures called pyramids, within which lie the pyramidal tracts.
The pyramidal tracts are made up of the corticospinal tract (running from the cerebral cortex to the spinal cord) and the corticobulbar tract (running from the motor cortex of the frontal lobe to the cranial nerves in the brainstem)

To know more about medulla oblongata, refer:

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2 years ago

Thigmitropism is a plant growth response to _ . A. water B. touch C. light D. humidity

nirvana33 [79]

The answer is B touch

4 0

3 years ago

Read 2 more answers

Visit the website below and use the information to answer the following question.

cestrela7 [59]

secondary succession is the ecological succession that occurs after the initial succession has been disrupted and some plants and animals still exist. It is usually faster than primary succession

7 0

3 years ago

Read 2 more answers

A fossil is discovered that has only 12.5% of the carbon-14 that it would have had originally (when the animal was alive). If th

mariarad [96]

Answer:

The fossil is 17,100 years old.

Explanation:

The decay equation:

$\frac{dN}{dt}\propto -N$

$\Rightarrow \frac{dN}{dt}= -\lambda N$

$\Rightarrow \frac{dN}{N}= -\lambda dt$

Integrating both sides

$\Rightarrow \int\frac{dN}{N}= \int-\lambda dt$

$\Rightarrow ln |N|=-\lambda t+c$

When t=0, N= $N_0$ = initial amount

$ln |N_0|=-\lambda .0+c$

$\Rightarrow ln |N_0|=c$

$\therefore ln |N|=-\lambda t+ln|N_0|$

$\Rightarrow ln |N|-ln|N_0|=-\lambda t$

$\Rightarrow ln |\frac {N}{N_0}|=-\lambda t$

$\Rightarrow \frac {N}{N_0}=e^{-\lambda t}$

$\Rightarrow N=N_0e^{-\lambda t}$

The decay equation is

$N=N_0e^{-\lambda t}$

Given that,

The half life of carbon - 14 is 5700 years.

For half life, $N=\frac{1}{2} N_0$

To find the value of $\lambda$ , we need to put the value of N and t in the decay equation.

$\frac12N_0=N_0e^{-\lambda \times 5700}$

$\Rightarrow \frac12=e^{-\lambda \times 5700}$ [ Divided $N_0$ both sides]

Taking ln both sides

$\Rightarrow ln| \frac12|=ln|e^{-\lambda \times 5700}|$

$\Rightarrow ln| \frac12|={-\lambda \times 5700}$

$\Rightarrow \lambda= \frac{ln| \frac12|}{-5700}$

$\Rightarrow \lambda= \frac{ln|1|-ln|2|}{-5700}$ [ $ln|\frac mn|= ln |m|-ln |n|$ ]

$\Rightarrow \lambda= \frac{ln|2|}{5700}$ [ln 1= 0]

The fossil has only 12.5% of the carbon carbon-14 that it would have had originally.

So, $N=\frac{12.5}{100} N_0$

Then,

$\frac{12.5}{100} N_0=N_0e^{-\frac{ln|2|}{5700}t$

$\Rightarrow \frac{12.5}{100} =e^{-\frac{ln|2|}{5700}t$

Taking ln both sides

$\Rightarrow ln|\frac{12.5}{100} |=ln|e^{-\frac{ln|2|}{5700}t}|$

$\Rightarrow ln|\frac{12.5}{100} |={-\frac{ln|2|}{5700}t}$

$\Rightarrow t=\frac{ ln|\frac{12.5}{100}|} {-\frac{ln|2|}{5700}}$

$\Rightarrow t=\frac{ ln|\frac{12.5}{100}|\times 5700} {-{ln|2|}}$

$\Rightarrow t=17,100$

The fossil is 17,100 years old.

7 0

4 years ago

Amy is riding on a train. She wants to sit at the front of the train for a better view, so she gets up to change her seat. Just

Alexus [3.1K]

Answer:

Have you ever been in a bus, a train, or a car ?

What happens to you when it stops suddenly ?

A body in motion continues in motion unless

an external force acts on it and makes it stop.

Amy's body keeps moving forward when the train stops.

She pitches forward, and if she doesn't reach out and grab

a seat or a seated person, she may lose her footing and fall

on her face.

Choice - 'A' is a very good explanation.

The other choices aren't.

'C' is a good hunch, but it only applies to her feet.

The rest of her keeps going.

'D' is nonsense. There are no mysterious forces of

'repulsion' or 'attraction' on the train.

tbh google

4 0

3 years ago