What is the basic unit of life in all living organisms?

• Tissue

• Cell

• Organ

• Organ System

Answer explanation

The basic unit of life in all living organisms is the cell. Cells are the smallest structural and functional units, making them essential for all biological processes.

Tags

NGSS.MS-LS1-1

Which of the following is an example of a tissue in the human body?

• Heart

• Muscle

• Digestive System

• Neuron

Answer explanation

Muscle is a type of tissue in the human body responsible for movement. The heart is an organ, the digestive system is a group of organs, and a neuron is a type of cell, not a tissue.

Tags

NGSS.MS-LS1-3

Identify the organ system responsible for transporting nutrients and oxygen throughout the body.

• Respiratory System

• Circulatory System

• Digestive System

• Excretory System

Answer explanation

The Circulatory System is responsible for transporting nutrients and oxygen throughout the body via blood. The Respiratory System facilitates gas exchange, the Digestive System processes food, and the Excretory System removes waste.

Which organ is part of the digestive system and is responsible for nutrient absorption?

• Stomach

• Liver

• Small Intestine

• Pancreas

Answer explanation

The small intestine is the primary organ in the digestive system responsible for nutrient absorption. It follows the stomach and is where most digestion and absorption of nutrients occurs.

Explain how the muscular system and the skeletal system work together to facilitate movement.

• Muscles contract to move bones at joints.

• Bones produce energy for muscles.

• Muscles and bones are separate and do not interact.

• Bones contract to move muscles.

Answer explanation

The correct choice explains that muscles contract to pull on bones at joints, enabling movement. This interaction is essential for all physical activities, as muscles and bones work together to facilitate motion.

Describe the role of the nervous system in maintaining homeostasis in the body.

• It transports oxygen to cells.

• It breaks down food into nutrients.

• It sends signals to regulate body functions.

• It filters waste from the blood.

Answer explanation

The nervous system plays a crucial role in maintaining homeostasis by sending signals to regulate body functions, such as heart rate, temperature, and fluid balance, ensuring the body operates within optimal conditions.

Compare the functions of the respiratory system and the excretory system.

• Both systems are involved in nutrient absorption.

• The respiratory system exchanges gases, while the excretory system removes waste.

• Both systems are responsible for circulating blood.

• The respiratory system removes waste, while the excretory system exchanges gases.

Answer explanation

The correct choice highlights that the respiratory system is responsible for gas exchange (oxygen and carbon dioxide), while the excretory system focuses on removing waste products from the body.

Analyze how the circulatory and respiratory systems work together to deliver oxygen to cells.

• The circulatory system pumps oxygen directly into cells.

• The respiratory system filters oxygen, and the circulatory system transports it to cells.

• The circulatory system absorbs oxygen from food, and the respiratory system transports it.

• The respiratory system exchanges oxygen in the lungs, and the circulatory system delivers it to cells.

Answer explanation

The correct choice explains that the respiratory system facilitates the exchange of oxygen in the lungs, while the circulatory system is responsible for transporting that oxygen to cells throughout the body.

Tags

NGSS.MS-LS2-3

Evaluate the impact of a malfunctioning excretory system on other body systems.

• It would only affect the digestive system.

• It would have no impact on other systems.

• It could lead to a buildup of toxins affecting multiple systems.

• It would improve the efficiency of the circulatory system.

Answer explanation

A malfunctioning excretory system can lead to the accumulation of toxins in the body. This buildup can adversely affect multiple systems, including the nervous and circulatory systems, causing widespread health issues.

Tags

NGSS.MS-LS1-3

Predict how a failure in the nervous system might affect the muscular system.

• Muscles would function normally without any issues.

• Muscles would receive incorrect signals, leading to spasms or paralysis.

• Muscles would become stronger and more efficient.

• Muscles would start producing their own signals.

Answer explanation

A failure in the nervous system disrupts communication with muscles, causing them to receive incorrect signals. This can result in spasms or paralysis, as the muscles cannot function properly without accurate nerve input.