Question

You go on a long hike one day. Even though the temperature outside increases steadily throughout the day, your internal temperature stays relatively stable. When your body temperature begins to get too high, your brain detects the change and initiates heat losing actions, such as sweating.  What is the control center in this homeostatic mechanism?

		The increased temperature
		The brain
		The sweat glands
		The blood

Which of the following lists the levels of organization in order from smallest to largest?

		Atoms--> Cells--> Molecules--> Organs--> Organisms
		Atoms--> Molecules--> Cells--> Organs--> Organisms
		Organisms-->Organs--> Cells-->Molecules-->Atoms
		Atoms--> Cells--> Molecules--> Organisms--> Organs

Which of the following lists the structures in order from largest to smallest?

	a.	cardiovascular system--> blood--> artery -->red blood cell-->hemoglobin
	b.	hemoglobin-->red blood cell-->blood-->artery-->cardiovascular system
	c.	cardiovascular system--> artery-->blood-->red blood cell-->hemoglobin
	d.	hemoglobin  --> artery-->blood-->red blood cell--> cardiovascular system

Osmosis can be defined as ______.

	a.	the diffusion of a solute
	b.	active transport
	c.	the diffusion of nonpolar molecules
	d.	endocytosis
	e.	the diffusion of water

Diffusion ______.

	a.	requires an input of cellular energy
	b.	is the result of the potential energy of atoms
	c.	is driven by an input of cellular energy
	d.	proceeds until equilibrium is reached
	e.	occurs when particles spread from areas where they are less concentrated to areas where they are more concentrated

You are at the beach on a hot summer day.  You have no more fresh water left so you begin to drink water from the ocean. Which of the following may occur?

	a.	you dehydrate yourself due to loss of water from your cells through osmosis
	b.	you quench your thirst
	c.	none of these
	d.	your cells become stiff
	e.	your cells lyse, due to the excessive intake of salt

A cell is losing water to its environment. The cell is in a(n) _________________ solution.

	a.	You can not tell based on the description.
	b.	hypotonic
	c.	isotonic
	d.	endotonic
	e.	hypertonic

1. Which of the following can be found in the cell (plasma) membrane?  Select all that apply.

   		phospholipids
   		carbohydrates
   		transport proteins
   		nucleic acids When blood calcium levels fall too low, the body will stimulate cells called osteoclasts. These osteoclasts have a specialized plasma membrane with a ruffled border. This allows for efficient release of acids and enzymes to dissolve bone tissue, releasing calcium back into the blood. As a result, blood calcium level rises back to normal levels. This is an example of which of the following?

2. 		Positive feedback
   		Negative feedback
   		Corrective feedback
   		Quantitative feedback

1. When blood calcium levels fall too low, the body will stimulate cells called osteoclasts. These osteoclasts have a specialized plasma membrane with a ruffled border. This allows for efficient release of acids and enzymes to dissolve bone tissue, releasing calcium back into the blood. As a result, blood calcium level rises back to normal levels. The ruffled border of the osteoclast is an example of which of the following?

   		living things being organized
   		structure complementing function
   		homeostasis
   		biological feedback

1. Matching the terms associated with the stages of human development with their correct description(some answers may be used more than once).

   -       A.       B.       C.       D.    zygote       -       A.       B.       C.       D.    placenta       -       A.       B.       C.       D.    helps dispose of the embryo's waste       -       A.       B.       C.       D.    structure, which contains a single developing egg surrounded by cells that nourish it       -       A.       B.       C.       D.    a series of rapid divisions of the fertilized egg

   A. a single cell formed by the union of a sperm and egg B. provides nourishment and energy to the embryo C. follicle D. cleavage

2 points   

QUESTION 12

Answer 1

Answer to Q1:-

The increased body temperature is sensed by the hypothalamus in brain. Hypothalamus plays a role in the thermoregulation.

Answer to Q2:-

The correct answer is:-

Atoms, molecules, cells, organs, organisms

This is the correct order from the smallest to the largest level of organization.

Answer to Q3:-

The correct order of thr largest to the smallest structures is:-

Cardiovascular system, blood, artery, red blood cells, hemoglobin.

Answer to Q4:-

Osmosis is defined as the movement of the solute from its higher concentration to the lower one through the semipermeable membrane. Option (a) is correct.

Answer to Q5:-

Diffusion occurs until equilibrium is achieved.

Answer to Q6:-

Drinking excess salt water from ocean will lead to dehydration due to loss of excess water from the cells through osmosis. This may lead to coma like condition in the body.

Answer to Q7:-

Eater is moving from a higher concentration in crll towards lower concentration of solute in the environment. Thus, cell is in hypertonic condition.

Answer to Q8:-

Phospholipids, carbohydrates and transport proteins can be found in cell membrane. Nucleic acids are present in the nucleus of the cell.

Answer to Q9:-

The release of calcium from osteoclasts is regulated by parathyroid glands by negative feedback loop mechanism. Thus, this is an example of negative feedback.

Answer to Q10:-

Structure complementing function is the correct answer.

Answer to Q11:-

The pattern of match points is not clearly written. Still trying to provide the best of my understanding.

Zygote is the single cell formed by the union of a sperm and an egg.

Placenta is the structure that provides the noirishment and protects the developing embryo.

Division of the fertilized egg is due to cleavage process.